The Tunze Care Magnet Strong suits thick glass from 15 to 20 mm when you want a slim blade magnet that stays outside the water. The Flipper Pico Magnetic Algae Scrubber is the clearer choice for nano glass up to 6 mm, because the compact flip head reaches corners without a long handle.
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These aquarium algae scrapers were chosen from makers’ published specifications and live UK retail listings, checked October 2026. We have not used the tools ourselves. Specs below repeat only figures the listing or maker shows.
Which Scraper Type Matches Your Glass Thickness?
Match the tool to pane thickness and material before you buy an algae scraper for aquarium glass, because a weak magnet slips on thick glass and a steel blade can mark acrylic. Magnetic pairs stay on the dry side of the pane and drag a pad or blade inside. Long handle scrapers put a steel blade on a 48 to 65 cm shaft so you can reach the base of a tall tank. A short handheld blade such as the JBL Aqua-T Handy stays in your grip and suits spot cleaning near the waterline.
Measure glass at a top edge with a ruler if the tank paperwork is missing. Standard UK starter kits often sit around 4 to 6 mm. Larger rimless tanks can run 10 to 15 mm, and some marine cubes go thicker still. The Flipper Pico Magnetic Algae Scrubber is stated for glass up to 6 mm. The Flipper Cleaner Float lists glass and acrylic up to 19 mm. The AQQA Magnet Fish Tank Glass Cleaner is stated for 1.0 to 2.5 cm panes. The Tunze Care Magnet Strong is stated for 15 to 20 mm glass. A handle scraper ignores magnet strength, so it remains useful on any glass thickness if you can reach the pane.
How Do You Avoid Scratches and Silicone Damage?
Lift the tool off the pane before you drag it across a gravel line, because trapped sand acts like grit on glass. Keep steel blades off silicone seams. The JBL Aqua-T Handy listing notes that the blade is meant to spare the aquarium silicone when you stay on the glass itself. On acrylic, fit the plastic blade that comes with the hygger Aquarium Magnet Cleaner, the AQQA Magnet Fish Tank Glass Cleaner, and the Fishnanny dual-blade magnet used in reserve. Move in straight lines rather than arcs so a corner of the blade cannot dig in.
An aquarium glass scraper only clears the pane. Green water, brown diatoms on gravel, and hair algae on plants still need water changes, a working filter, and a sensible light period. The RSPCA fish environment advice recommends eight to 10 hours of artificial light a day and keeping the tank away from a window, because extra daylight pushes algae and can heat the water. Pair scraping with a full cleaning kit and a gravel vacuum so waste that feeds algae leaves the tank.
What Should You Check Before You Put a Blade in the Tank?
Rinse a new scraper in tank water and look at the pad or blade for moulded flash or grit before the first pass. Confirm whether the tank is glass or acrylic. Steel blades belong on glass only. Plastic blades belong on acrylic, and they also give a gentler first pass on new glass. The QLK 65 cm Aquarium Algae Scraper and the Pawfly 65cm Aquarium Algae Scraper both ship a plastic brush head as well as 3CR13 steel blades, so you can sweep soft film before you switch to the razor. The Aqueon Aquarium Algae Scraper Medium uses separate pads for glass and acrylic and a bowed, weighted inner block that drops if the magnet parts.
Park a strong magnet on a spare piece of cardboard when it is out of the tank so the two halves do not slam together. The Tunze Care Magnet Strong is 86 mm wide and 140 mm long, which is a large contact patch on a 15 to 20 mm pane. The Fluval Razor+ Algae Scrubber is the small magnet in this set, with a removable blade and an abrasion-resistant pad for daily film rather than a long reach.
How Do These Aquarium Algae Scrapers Compare?
| Product | Type | Stated pane range | Blade or pad | Reach or size |
|---|---|---|---|---|
| Tunze Care Magnet Strong | Magnetic blade | 15 to 20 mm glass | Stainless blade plus two spare plastic blades | 86 x 140 mm |
| Flipper Pico Magnetic Algae Scrubber | Flip magnet | Glass up to 6 mm | Abrasive pad and removable scraper | Compact pico head |
| Flipper Cleaner Float | Flip magnet, floats | Glass and acrylic up to 19 mm | Scrubber and scraper that flip | Max float body |
| hygger Aquarium Magnet Cleaner | Floating magnet | Not stated in metric on the listing | Stainless blade and plastic blade | Two detachable scrapers |
| AQQA Magnet Fish Tank Glass Cleaner | Floating magnet | 1.0 to 2.5 cm | Stainless blade and plastic blade | XL ABS body |
| Fluval Razor+ Algae Scrubber | Small magnet | Not stated | Removable blade and abrasion-resistant pad | Small magnet block |
| JBL Aqua-T Handy | Handheld blade | Glass panes | Stainless blade, 7 cm wide, protective cap | 8 x 13.5 cm |
| QLK 65 cm Aquarium Algae Scraper | Handle scraper | Glass | 3CR13 steel blades plus plastic brush | 48 to 65 cm shaft |
| Pawfly 65cm Aquarium Algae Scraper | Handle scraper | Glass | 3CR13 steel blades plus plastic brush | 48 to 65 cm shaft |
| Aqueon Aquarium Algae Scraper Medium | Pad magnet | Glass and acrylic | Separate glass and acrylic pads | Medium, weighted inner pad |
How Should You Scrape a Panel Without Stressing Fish?
Plan a short, quiet session so fish can move to the far end while you work one pane at a time. Switch the light off if the fish start to dart. Keep the magnet or blade above the sand until the pad is clean.
- Net or herd fish away from the pane you will scrape, and lift ornaments that sit against that glass.
- Rinse the pad or blade in a bucket of tank water and pick off any grit.
- Fit the steel blade for glass or the plastic blade for acrylic, then start at the waterline and work down in straight strokes.
- Stop at the substrate line, lift the tool, and rinse it before the next pane so sand does not travel.
- Siphon the loosened film with a gravel vacuum, then wipe the outside pane so you can see what is left.
- Rinse the scraper, dry the blades, and store magnets with a spacer so they do not chip each other.
A scraper does not replace filtration. If the same film returns within days, test ammonia and nitrite, trim the photoperiod, and check the filter media rather than scraping harder. The OATA freshwater tank sheet asks for weekly water tests and partial water changes, and it warns you never to siphon by mouth. Once the pane is clear, a stable tank volume and a measured light cycle do more to keep glass readable than any blade.
Frequently Asked Questions
Can You Use a Steel Blade on Acrylic?
No. Use the plastic blade or the acrylic pad that ships with the magnet. Steel is for glass only. If the listing does not include a plastic blade, pick a pad magnet or a plastic-only head.
Why Does a Magnet Keep Losing the Inner Half?
The pane may be thicker than the magnet is rated for, or the inner half may have drifted onto a brace. Check the stated millimetre range and keep the inner block opposite the outer handle for the whole stroke.
Do You Need Both a Magnet and a Handle Scraper?
A magnet covers daily film on the front pane. A 65 cm handle scraper helps on the rear glass behind a filter or on a deep tank where a magnet cannot reach the bottom corners.
How Often Should You Replace Scraper Blades?
Change a steel blade when the edge looks rounded or nicked. A nicked blade scratches glass. The QLK and Pawfly kits include spare 3CR13 blades so you can swap without buying a new shaft.
Will Scraping Clear Green Water?
Scraping only removes algae that is attached to the pane. Green water is free-floating and needs a water change, a check of the light period, and a working filter rather than a sharper blade.
Last reviewed: 5 October 2026.
Aquarium Algae Scrapers to Compare
Tunze Care Magnet Strong
A slim blade magnet for 15 to 20 mm glass, with a stainless blade and spare plastic blades for owners who want the contact patch kept as a blade rather than a thick pad.
Flipper Pico Magnetic Algae Scrubber
A compact black flip magnet for glass up to 6 mm, switching from an abrasive pad to a scraper so nano tanks can be cleaned from the dry side.
Flipper Cleaner Float
A larger flip magnet that floats if the halves part, stated for glass and acrylic up to 19 mm, so deep tanks keep the inner block retrievable at the surface.
hygger Aquarium Magnet Cleaner
A floating magnet with two detachable scrapers, one stainless and one plastic, for freshwater or saltwater glass and acrylic where you want a pad plus a blade in one pair.
AQQA Magnet Fish Tank Glass Cleaner
An XL ABS magnet stated for 1.0 to 2.5 cm panes, with steel and plastic scrapers and a floating inner block for large glass or acrylic displays.
Fluval Razor+ Algae Scrubber
A small magnet with a removable blade and an abrasion-resistant pad, suited to daily film on modest glass rather than a long reach down a tall pane.
JBL Aqua-T Handy
A short handheld glass cleaner with a 7 cm stainless blade and a protective cap, useful for waterline spots and silicone-safe strokes on the pane itself.
QLK 65 cm Aquarium Algae Scraper
A 48 to 65 cm alloy shaft with a rotatable head, a plastic brush and 3CR13 steel blades for owners who want to reach the base of a tall glass tank from above.
Pawfly 65cm Aquarium Algae Scraper
An orange 48 to 65 cm multi-angle handle kit with a plastic brush and five 3CR13 blades, aimed at glass reef or planted tanks where corners need a rotatable head.
Aqueon Aquarium Algae Scraper Medium
A medium pad magnet with separate glass and acrylic pads and a bowed, weighted inner block that drops if the halves part, rather than floating to the surface.