Choose the softest tool in the drawer
A betta tank needs only a soft, aquarium-only algae pad, because the glass area is small, the film is usually light, and anything harsher risks the fish rather than the algae. Household sponges are out entirely: many carry detergents or antibacterial treatments, and even a plain-looking one can hold residue from sinks and surfaces. Rinse your hands and the pad in clean water, keep a towel under the tank's front edge, and remember that in a small betta setup every drip and jolt registers, so set the lid and any removed decor down gently instead of tapping them against the rim.
Expect company while you clean
Most bettas do not flee the pad; they shadow it, flare at it, and inspect the newly clear glass behind it, which is charming until the fish drifts into your working area. Use short, slow strokes and simply pause when your betta parks in front of the pad, nudging gently onward rather than pushing past a fish whose flowing fins trail close to the surface. Work the front and viewing sides thoroughly, and consider leaving a portion of one back pane lightly filmed, since many bettas graze and rest against surfaces and a surgically bare tank is not the goal.
Protect the surface zone where a betta lives
Bettas breathe air at the surface and build their resting routine around the top few centimetres, often sleeping on a leaf pressed near the glass. Clean that band of glass last and most gently, keep the waterline steady, and never dip a pad loaded with loosened algae through the surface film repeatedly, which just spreads a green slick across the calm top water a betta prefers. If your fish has a bubble nest anchored in a corner, leave that corner's glass alone entirely; the nest will be rebuilt in time, but there is no reason to erase it for the sake of one wipe.
Why magnetic cleaners deserve extra caution here
A magnetic cleaner that seems convenient on a big tank can be a genuine hazard in a betta's small one: the halves snap together with enough force to trap a trailing fin, and a startled betta bolting from the click can tear fins on decor. If you use one at all, slide the halves together slowly at the glass edge, far from where the fish is hovering, and keep it moving rather than parked. Many betta keepers retire the magnet altogether once they watch their fish investigate it, and a hand pad's slower pace suits the scale of the job anyway.
Tie the wipe to the water change rhythm
The tidiest routine pairs the glass wipe with the moments just before a partial water change, so the algae you loosen gets siphoned out instead of resettling on plants and gravel. Film returning within a few days in a betta tank usually traces back to a light left on too long or pellets sinking uneaten past a slow feeder, both kinder fixes than scrubbing more often. Recording that paired routine in KinsLe's Care Teams, with each wipe assigned and its completion timestamped, gives anyone helping with the betta one clear record of when the glass was last done.