A magnet cleaner is the small tool that makes keeping the front glass spotless almost effortless — you glide a magnet across the outside and the inner half scrubs algae off, no wet sleeves, no removing decor. It is one of the cheapest quality-of-life upgrades in the hobby. This UK guide covers the best aquarium magnet cleaners in 2026.
Here are our picks and how to use one safely.
- A magnet cleaner scrubs algae off the glass from outside — no wet sleeves or removing decor.
- Match magnet strength to your glass thickness, and choose a floating inner half.
- The Flipper-style dual-scraper is the reliable all-rounder; mini versions suit nano tanks.
- Keep the magnet clear of the substrate — trapped grit will scratch the glass.
What to look for
- Strength matched to glass thickness — bigger tanks have thicker glass and need stronger magnets.
- A floating inner half, so if it detaches it rises to the surface rather than trapping grit at the bottom.
- A scraper edge for stubborn spots of green spot algae.
Our top picks
Best overall — Flipper / dual-scraper magnet. A Flipper-style magnet cleaner flips to a blade for stubborn algae and floats if it comes off — the reliable all-rounder.
Best value — standard floating magnet. A floating magnet cleaner handles everyday algae film well on most tanks.
Best for nano tanks — mini magnet cleaner. A nano magnet cleaner fits small tanks and thin glass.
Use it safely
The one real risk is grit: a grain of substrate caught under the magnet will scratch the glass. Keep the magnet a few centimetres clear of the substrate, and if it picks up grit, rinse it before continuing. For persistent green spot algae, pair it with a blade scraper. See how to get rid of algae for tackling the root cause.
Frequently asked questions
Are aquarium magnet cleaners any good?
Yes — they make keeping the front glass clean almost effortless, scrubbing algae from outside the tank. Choose one with strength matched to your glass and a floating inner half.
Will a magnet cleaner scratch the glass?
Only if grit gets trapped underneath. Keep the magnet a few centimetres above the substrate and rinse it if it picks up a grain of sand or gravel.
What size magnet cleaner do I need?
Match it to your glass thickness — larger tanks have thicker glass and need stronger magnets, while nano tanks need a small, lighter cleaner designed for thin glass.
— Jaqline Smalling, FishForever
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