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Use pieces of felt to clean algae off acrylic fish tanks. It doesn't scratch.
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Here are questions related to Cleaning an Aquarium.
What is the safest, easiest way to clean a fish tank? Is there a solution you can buy to clean the tank up that is not too expensive?
By candita from Suffolk, VA
Of course the safest way is no chemicals. If one of the soft scrubbers, as talked about below, don't work for you, you can try using a single-edged razor blade, but be careful not to get the blade too close to the sealant at the edges of the glass or you could damage it.
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What is the best thing to use to clean a dirty glass fish tank that has been sitting for sometime and won't hurt any fish put in it afterwards?
By Toy Lady
You can buy "scratch pads" specifically for aquariums and that would be the safest to use on the glass. ($3 @ Walmart) I'm a little unsure if one made for dishes really is free of soap residue. Some aren't. coolchinchilla (07/11/2005)