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I just bought a fish tank not even a few months ago and I cleaned it all out when my fish batch of fish died and then I put more fish and I noticed the water keeps getting cloudy and there are black stains on the sides of the tank. I bought a albino cory catfish to clean it but I dont see that its doing its job. my tank gallon is 15 gallon and I have the filter that it came with on and running with the light.
its probably poo inevitably every fishtank with fish in it will get cloudy and fish need to poo I suggest taking the fishout and putting them in a diferent bowl temporarily while you manually clean the tank/change the water or buy a better filter
clean he tank and get a filter that works good=) but don't use dangerous chemicals cause you will kill the fishies!!! lol