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That could be the issue. She does seem to have backed off a bit in the last day or so though, and the other fish don't seem stressed by her and are still swimming around the tank. I will keep an eye on it and if it gets any worse I may take her back to the pet shop.

It could be that the aggressive one is pregnant then, although she doesn't look it. She has actually backed off a bit in the last day or so, and the other fish are still coming up for food and still swimming around the tank, going wherever they want, so I think it's okay for now hopefully!

Thanks for replying! I do yeah, I've built up the right corner with some fake plants which is where one of the Platys seems to be currently hiding (or just resting), so at least they do have somewhere to hide. It seems like the fish is dominating the middle bottom part of the tank and nips...

Yesterday I bought 3 new Platys to join my one existing Platy in a 34 litre tank (all female). They seemed to get on fine for the first few hours, swimming together etc, but now one of the newbies is nipping at two of the other Platy. Interestingly, it is not nipping at the Platy that I think is...