We keep mosquitofish. We bought them to release into our pond for this purpose, but realized they would harass our goldfish and that the goldfish probably would

We keep mosquitofish. We bought them to release into our pond for this purpose, but realized they would harass our goldfish and that the goldfish probably would do a good enough job at this themselves. So we used them as dither fish for a nervous flowerhorn cichlid, and after he passed they now have the run of a 140 gallon tank to themselves. They spend all their time chasing each other / going after anything that moves so it's no wonder they have such an outsize environmental impact[1]. Ours have lots of hiding places and a huge tank for just a handful of them Apparently they give live birth, but we've yet to witness it, likely because any babies are immediately eaten -- or because the females are unlikely to give birth in the presence of males (supposedly -- I haven't confirmed this anywhere, just seen it mentioned on various fishkeeping forums). [1] https://en.wikipedia.org/wiki/Mosquitofish#Environmental_impact https://en.wikipedia.org/wiki/Mosquitofish#Environmental_imp...