The short answer
Flipper FLOAT Standard for glass or acrylic up to 1/2 in (Flipper); Continuum AquaBlade P for acrylic; API Algae Scraper for Glass for glass on a budget.
Our verdict
Our Top Picks at a Glance
An algae scraper is a magnet pair or a blade or pad on a handle. Choose by tank: glass or acrylic, and how thick. Eight picks, seven brands. Seachem’s scraper is out: its Amazon offer came from a third-party seller we could not verify. More tools: cleaning and maintenance.
Algae scraper finder
Find the algae scraper for your tank
Pick your tank and what you want to spend. Tiers are by product price relative to these eight. The suggestion is our editorial starting point, drawn from the makers' own ratings, not a test result.
Compare the picks
Compare the 8 algae scrapers
The makers’ own ratings for the version we link.
Flipper FLOAT Standard2-in-1 flip magnetGlass, acrylic, reefFloating magnet$49.99
Evidence: owner reports, no independent test
Mag-Float 125Floating glass magnetGlass, large tanksFloating magnet$33.89
Evidence: owner reports, no independent test
Tunze Care Magnet StrongMagnet for thick glassThick glass, reef, not acrylicMagnet$99.99
Evidence: owner reports, no independent test
Aqueon Algae Magnet SmallBudget small-tank magnetSmall tanks, glass, acrylicWeighted magnet$7.94 Prime
Evidence: maker specs only, no independent test
Two Little Fishies NanoMagNano and bowl magnetNano tanks, bowlsSmall magnet$15.28
Evidence: Reef Builders (a retailer), not independent
Flipper Platinum 18 inCard-blade hand scraperGlass, acrylicHand scraper$21.99
Evidence: owner reports, no independent test
Continuum AquaBlade PPlastic-blade acrylic scraperAcrylic, deep tanksLong scraper$32.98 Prime
Evidence: maker specs only, no independent test
API Algae Scraper for GlassBudget pad on a handleGlass, budgetPad on a handle$8.99 Prime
Evidence: Glass Box Diaries, used on glass tanks; glass or acrylic version not stated
How We Weighed the Algae Scrapers
How this guide was built
built from manufacturer pages, the live Amazon listings, one independent blog review, one retailer-affiliated guide (Reef Builders, 2020) and owner reports in aquarium forums; we have not tested these products ourselves.
The criteria, in order
- Fitness for the task: the surface (glass or acrylic) each maker names.
- Fit for the tank and substrate: rated thickness and tank size; sand cautions.
- Ease of use: floating or weighted, handle, blades.
- Durability: blade life, where stated.
- Value: price tier ($ to $$$, relative to these eight). All were in stock on 2026-11-03: three sold by Amazon.com, two by Flipper’s store and three by aquarium retailers (SaltwaterAquarium, MarineAndReef, Champion Lighting).
What reef and freshwater owners say
What reef and freshwater owners say
In the top r/ReefTank thread, owners name “Flipper or tunze for magnetic”; one found the Flipper “takes more effort the closer to the bottom”, and some still use a plain razor blade. In r/AquariumHelp, owners warn about blades in the corners (“don’t slice off the silicone glue”) and on acrylic.
Detailed Reviews: The 8 Algae Scrapers
Flipper FLOAT Standard, 2-in-1 flip magnet
Verdict
A magnet that flips from scrubber to blade, per Flipper.
Evidence: No independent test; owner reports. r/ReefTank owner: Flipper, model not stated.
The FLOAT floats if it comes apart and includes “Stainless Steel for glass tanks and ABS plastic for acrylic tanks” blades; its “3 contact points” aim to minimize “the chance of trapped sand” (Flipper). An r/ReefTank owner: “Flipper is pricy, but it works fantastically”; another says it “takes more effort the closer to the bottom it takes” (models not stated).
Specs (linked: Standard)
- Glass or acrylic to 1/2 in (Flipper)
Pros
- Scrubber and blade in one magnet, with glass and acrylic blades
Cons
- Premium price tier among these eight
Mag-Float 125 Medium Glass, Floating glass magnet
Verdict
Mag-Float’s medium floating cleaner for glass.
Evidence: No independent test; owner reports. r/Aquariums owner: Mag-Float, size not stated.
The blade is “sold separately” (Mag-Float); acrylic tanks have their own Mag-Float line. In a 2014 r/Aquariums thread, one owner “Never had it scratch”; another says they “can scratch your tank very easily”.
Specs (linked: 125, glass)
- Glass to 3/8 in, tanks to 125 gal (Mag-Float)
Pros
- Floats when the two halves separate, per Mag-Float
Cons
- Sold as the glass model (Mag-Float lists acrylic tanks as a separate line); the blade is an extra purchase
Tunze Care Magnet Strong with Care Booster, Magnet for thick glass
Verdict
For glass 15 to 20 mm thick; Tunze does not recommend it for acrylic.
Evidence: No independent test; owner reports. r/ReefTank owner: Tunze, model not stated.
Tunze includes plastic blades, a stainless blade for “particularly tough algae” and Care Booster floats. Its inner magnet sits “more than 3 mm away” from the glass to keep sand from jamming, yet “scratches can occur due to adhering particles”. Tunze: “We expressly do NOT recommend using the Care Magnet on ACRYLIC!” The Amazon description mentions acrylic; we follow the maker. An r/ReefTank owner: “Tunze has been my favorite by far” (model not stated).
Specs (linked: Strong with Care Booster)
- Glass 15-20 mm; blade life “several months up to approx. one year” (Tunze)
Pros
- Rated for glass up to 20 mm thick, per Tunze
Cons
- Not recommended for acrylic, per Tunze; premium price tier
Aqueon Algae Magnet Small, Budget small-tank magnet
Verdict
A low-cost magnet with a glass pad and an acrylic pad.
Evidence: No independent test; maker specs. Source: Aqueon.
Aqueon rates the Small for “glass or acrylic aquariums up to 20 gallons or 1/4″ thickness”. It is weighted; its bowed base lets the pad “rest above the gravel”.
Specs (linked: Small)
- Glass or acrylic to 1/4 in or 20 gal (Aqueon)
Pros
- Glass and acrylic pads in one pack, per Aqueon
Cons
- Sinks rather than floats if it comes apart
Two Little Fishies NanoMag, Nano and bowl magnet
Verdict
A small magnet made for nano tanks and curved bowls.
Evidence: Retailer review (sells it), not independent. Reef Builders: NanoMag.
The NanoMag “slips safely between polyps and viewing windows” and cleans “windows up to 1/2″ thick”, per the maker; the listing says “glass up to 3/8″ thick”. Reef Builders, whose store partner sells it, calls it “a must for any nano tank owner”.
Specs (linked: NanoMag)
- To 1/2 in (maker); 3/8 in (listing)
Pros
- Small enough for nano tanks and curved bowls, per the maker
Cons
- Neither the maker page nor the listing we read mentions acrylic
Flipper Platinum 18 in, Card-blade hand scraper
Verdict
A handle that takes old plastic cards as blades, for glass or acrylic.
Evidence: No independent test; owner reports. r/ReefTank owner: Platinum with stainless inserts, length not stated.
Flipper calls the Platinum “SAFE FOR BOTH GLASS AND ACRYLIC TANKS”; its stainless blade is “sold separately” and “for glass tanks only”. In r/ReefTank, an owner with the stainless inserts says “I love the thing”; another: “The flipper scraper sucks”.
Specs (linked: 18 in)
- Blade: any plastic card (Flipper)
Pros
- Takes plastic cards as blades: “you may never have to buy blades again!”, per Flipper
Cons
- Flipper’s page sells the stainless blade separately and “for glass tanks only”; the Amazon subtitle mentions a stainless blade, so check what ships
Continuum AquaBlade P, Plastic-blade acrylic scraper
long, plastic blade · Long scraper
Acrylic tank owners who need reach.
$32.98 from AmazonAs of Nov 4, 01:04 UTCVerdict
A long scraper with a plastic blade Continuum calls “softer than acrylic”, with caveats.
Evidence: No independent test; maker specs. Source: Continuum Aquatics.
Continuum’s footnote: the blade “can therefore pick up sand or small bits of gravel if shoved too hard down into the substrate”; check it with a fingernail. Continuum adds that “low grade imported acrylic” can be “easily scratched” and to test “in an inconspicuous area”. The long version has a “solid fiberglass” handle; Continuum lists 25 in.
Specs (linked: long, 24 in per listing)
- Cyan plastic blade (Continuum)
Pros
- Cyan plastic blade “softer than acrylic”, per Continuum
Cons
- The soft blade can pick up sand, and soft acrylic can still scratch, per Continuum
API Algae Scraper for Glass, Budget pad on a handle
Verdict
A pad on a long handle (18 in package length, per the listing), glass only.
Evidence: Independently reviewed, same series. Glass Box Diaries: API algae scraper, glass or acrylic version not stated.
API warns that “gravel will scratch glass surfaces” if caught on the pad. Glass Box Diaries, using it on glass tanks (version not stated), found it does “a decent job” in 40- and 29-gallon tanks, but is “not a fan”: it is “clunky to use in nano setups”, the “coarse pad” makes it “difficult to tell how much pressure you’re applying”, and “there are better and more user-friendly options”.
Specs (linked: glass version)
- “For glass aquariums only” (API)
Pros
- Extra-long handle that keeps your hand out of the water, per API
Cons
- Glass only; Glass Box Diaries is “not a fan” and found the pad pressure hard to judge
Glass or Acrylic: How to Avoid Scratches
- Match the tool to the tank. API says not to use its scraper on acrylic and Tunze does not recommend its magnet there; Continuum’s blade and Flipper’s cards are sold for acrylic; the FLOAT and Aqueon include an acrylic blade or pad.
- Keep sand out. API, Tunze and Continuum warn that sand or gravel on a pad or blade can scratch; an Aquarium Co-op forum owner says to “watch out getting gravel stuck” in Mag-Floats.
A scraper removes algae, not its cause; see algae growth, brown diatoms and green water, and our test kit guide. If fish look unwell, test the water and contact an aquatic veterinarian.
Frequently Asked Questions
Q. Do algae scrapers work?
Owners use them, with limits: a Co-op forum owner finds a magnet “not as effective” once algae builds up; some use a razor blade for hard spots.
Q. What can I use instead of an algae scraper?
Owners name melamine sponges, a razor blade on glass, a card on acrylic, and snails.
The bottom line
Final Verdict
Flipper FLOAT Standard (check price) for glass or acrylic up to 1/2 in; Continuum AquaBlade P (check price) for acrylic, with Continuum’s sand caveat; API Algae Scraper for Glass (check price) for glass on a budget; Tunze Care Magnet Strong (check price) for glass 15 to 20 mm thick.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
