An aquarium algae scraper clears the glass in two minutes. It does nothing about why the algae arrived, which is why some tanks need scraping weekly and others twice a year. Algae is a symptom of light and nutrients being out of balance — the scraper handles the visible part while you fix the input.
Magnetic cleaners stay in the tank and let you clear glass without wet sleeves, which means it happens more often. Telescopic scrapers reach corners, the bottom seam and behind ornaments where a magnet cannot follow, and they handle hard green spot algae that a magnet skates over. Most tanks want one of each.
Light duration and excess nutrients, in that order. More than eight to ten hours of light a day, sunlight hitting the tank, overfeeding, overstocking, and skipped water changes all feed it. UF/IFAS stresses that in any recirculating system water quality parameters should be kept as stable as possible through routine monitoring rather than reactive fixes.
Put the light on a timer at eight hours, move the tank out of direct sun, feed less, and increase water change frequency to weekly. Live plants help by competing for the same nutrients. Algaecides treat the bloom and leave the cause, so the algae returns on the same schedule it did before.
Keep the scraper clear of the substrate. A single grain of sand caught under a magnet or blade draws a permanent line across the glass, and acrylic scratches far more easily than glass. Stop the stroke a couple of centimetres above the sand line and clean that last band with a soft pad.
Soft green film on the glass is normal and usually means light or feeding is slightly high. Hard green spots point to too much light with too few nutrients for plants. Brown diatoms are typical in new tanks and fade as they mature. Stringy black growth signals unstable CO2 and flow in planted tanks.
See the small fish tank guide and the aquarium lighting guide, or browse Fish & Aquatic Pets.
No. Clear the front and side viewing panes and leave the back glass and hardscape alone. That growth is a food source for grazing species and a surface for beneficial bacteria, and scrubbing every surface every week keeps the tank in a permanent recovery cycle rather than letting it stabilise.
Weekly, at the water change. Frequent light passes are easier than occasional heavy scrubbing.
They graze, they do not fix the cause, and many grow larger or need more space than a small tank offers.
No. Household pads carry detergent residue and scratch, and the plastics are not rated for submersion.
Brighter or longer lighting with no matching increase in plants. Reduce the photoperiod first before anything else.
No. Diatoms are normal in the first weeks and usually fade as the tank matures.
A two or three day blackout knocks back a bloom, but it returns unless lighting and feeding change.
If you have any questions, here are some useful links:
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