Best Glass Scrapers and Blades for Aquarium Algae
Algae on the glass is inevitable in any aquarium. A good glass scraper removes it in seconds without getting your hands wet or scratching the glass. This best glass scraper aquarium guide from Gensou Aquascaping at 5 Everton Park reviews the main types and helps you pick the right tool for your tank.
Magnetic Glass Cleaners
Magnetic cleaners are the most popular option because they work without getting your hands in the water. An inner magnet with a scrubbing pad sits inside the tank, controlled by an outer magnet on the outside of the glass. Slide the outer magnet and the inner pad follows, scrubbing algae as it goes.
Best for standard glass tanks: The JBL Floaty, Mag-Float and Flipper are reliable choices. The Flipper is unique — it flips between a flat pad for daily maintenance and a blade edge for stubborn algae. Available in Singapore for $20–$50 depending on size.
Sizing matters: Magnetic cleaners are rated for specific glass thicknesses. A cleaner designed for 6 mm glass will not hold on 12 mm glass, and vice versa. Check your glass thickness before buying.
Caution with sand: If a grain of sand gets caught between the magnet pad and the glass, it will scratch. Always check the pad before each use and avoid running it near the substrate line.
Blade Scrapers
A long-handled blade scraper uses a razor blade or stainless steel blade to shave algae off the glass. Nothing removes stubborn green spot algae and coralline-like deposits faster. The ADA Pro Razor, ISTA Scraper and generic stainless steel scrapers are popular in Singapore at $10–$30.
Glass tanks only: Never use a metal blade on acrylic tanks — it will leave permanent scratches. For acrylic, use a plastic blade scraper or soft pad only.
Technique: Hold the blade at a 30–45 degree angle to the glass and push in one direction. Let the blade do the work — pressing too hard risks chipping the silicone seal at the edges.
Pad and Sponge Cleaners
Simple algae pads and sponges on a handle are the cheapest option ($3–$8). They work well for soft green algae but struggle with hard green spot algae. White melamine sponges (magic erasers) are surprisingly effective — they gently abrade algae without chemicals. Ensure any sponge you use is free of soap, detergents or antimicrobial coatings.
For Hard-to-Reach Areas
Corners, behind hardscape and near the substrate line are the hardest spots to clean. A flexible-head scraper or a credit card works well for corners. For behind rocks and driftwood, a pipe cleaner or old toothbrush (unused, no toothpaste residue) can reach tight spots. Some hobbyists keep a dedicated set of small cleaning tools just for these areas.
Cleaning Schedule
Scrape the front glass weekly as part of your regular maintenance routine. The sides and back can be cleaned less frequently — some aquascapers intentionally leave algae on the back glass for a natural green backdrop. Clean before your water change so loose algae gets removed with the siphoned water rather than floating around the tank.
Prevention Is Better Than Scraping
While a scraper is essential, reducing algae growth means less scraping. Maintain consistent light hours (6–8 hours), balance nutrients and CO2, avoid overfeeding, and add algae-eating species like nerite snails or otocinclus. A well-balanced tank produces minimal glass algae, making maintenance quick and effortless.
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5 Everton Park #01-34B, Singapore 080005 · Open daily 11am – 8pm
