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can you mix any kinds of killies in the same tank? if not what are the rules of compatibility? like would it be OK to mix pairs of many different kinds together or should you only have larger groups of fewer kinds?

You shouldn't mix killies in the same tank unless thespecies are completely different like rivulus/aphyosemion. Mixing 2 of a specie such as aphyosemions may cause hybridization and the fry would be sterile. If you don't plan on breeding them in that tank then it would be okay. Remember though that some females look alike but they are not the same.

Though it is true that killifish of the same genus will cross/hybrinize, the sad fact is, that they will NOT be sterile. And can reproduce again. Thus, causing a hybranized species. In the fish hobby/community, a hybranized fish that did not do so directly in nature, is taboo. If you plan on breeding, please do not house these fish together. As many cichlids have been hybrinized and have now entered the hobby, there is much contriversy over it. The killifish, still remains for the most part, pure in the hobby. Please, lets help to keep it that way.

Last edited by ACIDRAIN at 12-Nov-2004 05:02

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There is always a bigger fish...

ok hmm thats interesting! what about singles? can you keep just one of a species in with others of different kinds?

First let me clairy about the names here. Rivulus/Aphyosemion are the genus names and not the species name. The species name is the exact name of the fish. Aphyosemion australe, the Aphyosemion is the genus, and the australe is the species.

As for solitary animals, yes you can keep singular fish. The males are usually the better looking ones. Although, most of these fish will do better if kept in pairs. They will be more active and show more color. You cann keep more than just a pair of the same species together. Most will not fight. Many killifish breeders actually use reverse trios for spawning. This helps spread the genetics of two different males, instead of just one.

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There is always a bigger fish...