One of my Mollys has this strange growth on the end of her tail. The two fins just under her tummy don't look right either. I'm a total beginner so any help would be appreciated. The other Mollys look okay.
Hmm there seems to be a few too many fish for a 10 Gallon
Normally the rule of thumb is 1 small fish per gallon of water
A small fish to me is 1 - 1 1/2 inches
So given that Mollies can grow to triple that size, i would maybe consider something slightly bigger or take a few back to LFS. But on the flipside they may be ok as its the same species
Putting this aside it does like a fungus infection of some sort