so about a week ago i brought home three mollies. before the week was up two of the three were dead, and they took 3 of my other fish that i have had for over a month with them. i never saw any indications that anything was wrong.
today my remaining molly is swimming almost vertical, sometimes looking like he may flip over backwards.
i had done a water change right before i lost the fish.
i had my water tested at my LFS and was told that my PH was a little low, but all else looked fine. the tank is heavily planted and my ammonia, nitrates/nitrites were fine.
i'm afraid the mollies may have brought a disease or something home with them. i don't see any irregularities on their fins, and they are all eating and swimming fine.
any help would be much appreciated before i loose any more fishies.