So first of all, my water parameters:
(edit: not mollie death, i didn't mean to write death but reaaallyy sick molly)
It is a 40 gallon tank with 1 gourami, 15-20 guppies and 4 mollies +occasionall fry that survives
Now i found a relative young black molly ill, he often lies on the side and seems to Hasehas trouble swimming. He is now in a quarantin tank. The problem is just that I now saw that some of my guppies have clamped fins, some more some less. I am thinking that maybe it's because of a internal parasite since I saw some stringy poop from the now ill molly fry. Does anyone of you maybe know what that could mean??