I bought some Endler's Livebearers two days ago. They're living with Corys, and all water parameters are fine (0 Ammonia, 0 Nitrite, 5ppm Nitrate, pH 7).

Over the last two days I've obseerved one of the females passing stringy white faeces, and now she's having difficulty swimming, usually upside down, still passing stringy white faeces, and she has a red blob on her side.

Any ideas what's up? I thought maybe internal parasites. I've got some Flubenol 15 in the post to treat the tank with just in case.

I had a very small male die this morning as well. Those two have always looked sick since I got them, so I suspect maybe they came in with something.

Thanks.