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The black dot on your fish can and probably is what is known as black spot disease, also known as diplopstomiasis, and it is caused by a parasite, in this case, flatworm larvae of the genus Neascus. Typically this occurs when new fish are added to an already established aquarium. I have never...

How long was the filter off? Leaving the filter off a little while should not be causing any fish to die. I leave mine off when cleaning or doing water changes, which in my larger tanks can be an hours long affair. Be careful when completely cleaning a tank and changing 100% of the substrate...

I believe that he either has fin rot, or one of the larger fish is nipping away at his fins. Since he is the only one affected, then it may just be bigger fish picking on him. If it is fin rot, then the fin rot needs to be treated quickly, as it looks like it is already in an aggressive stage...

Hello. New forum member here. So I have set up a sort of playground tank for my five Glo Danio's. It is a long five gallon Fluval SPec. They were and are always zipping all around, but recently, the pink one (Mr Pink) stopped eating. He just swims casually around on the bottom half of the tank...