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Can somebody please explain to my incompetent mother why you cannot keep 15 goldfish in a twenty gallon tank? Apparently they will be "fine". Please post here in layman's terms why it is not acceptable to do so, as she simply refuses to believe anything I say. Much appreciated!

This goldfish has had many 'cuts' over the past month or two, where it looks as though it's flesh is protruding through the scales. I originally thought that there was something sharp in the tank, so I removed some ornaments, but this did not help. I own four young goldfish in a twenty gallon...

Various water conditioners offer to remove ammonia, and promote good growth, etc, along with neutralizing chlorine/chloramines. So can I put a few drops into a functional aquarium with the fish purely for the ammonia reduction and growth, etc, maybe once per week alongside using the conditioner...

I recently bought three bunches of aquarium plant cuttings, but am having difficulty getting them to grow. 1 of the bunches has been completely destroyed by the goldfish, and the other two are going the same way. The problem is that I cannot get the cuttings to stay in a stable position within...

I have an 80 L / 20 gallon tank with four adult goldfish and one youth, so I need a pretty good filter. I'm currently using a cheap sponge biological filter which is doing pretty much nothing, so I need to upgrade pretty quickly. The trouble is; I'm finding it really difficult to choose which...

Recently a goldfish of mine has been having problems, which then led to death a few minutes ago upon writing this. Basically; it seemed to have developed some sort of flesh wound to one side with some sort of white 'flesh' protruding from the cut. While this was happening it would lay on the...