Last night I noticed one of my 4 Mollys didn't seem too good. Not moving around much, looked thin compared to rest and kept doing a shimmy or shiver .
I isolated it, fed it (it ate) and left it till the morning when it looked much more lively. When o got back home I reintroduced it thinking maybe it had missed out on some food but again it's seems lethargic, slow and doing a shimmy.
I've watching him for ages to try and spot any illness or parasite but other than looking like an empty belly I cannot see anything.
My water tests are all within safe limits and I'm changing 3rd water ever week. All my other stock are fine.