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Anonymous
To clear somethings up, the reason why breeders and most pet stores can keep so many gold fish or other fish for that matter in such small spaces is the amount of water they keep in their sumps/system wide, and how much water they are able to move per hour. I work with a 3,100 gallon system we have 3 pumps that move 10,000+ gph. We also have to reduce the temp. flowing into the gold fish, not only cause they like it cooler also to allow air to react with the water . Keep in mind the whole system set up to breed and sale fish is a temporary habitat. Most pet stores try to sell any given fish before 2 months(to keep maintenance prices low and make a profit).
So, just because you see 30+ goldfish 4" in a 20 gallon tank doesn't mean 1 can live in a 1 gallon bowl. However a black moor(depending on it's size already) can live a full life in a 5 gallon tank, a filter is always a plus. But, as long as there is a bubbler of some sore, and frequent water changes are done weekly it will live just fine.
The best stores to shop for any fish are local non-corporate owned, with well knowledge staff.
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