Hi everyone. I'm VERY new to the fish world. I have a 10 gal tank set up in my daughters room with three mollies. We've had it up and running for several weeks. Water tests have been great. I've been doing partial water changes weekly. Saturday one dalmation Molly died. Today the other one has been laying at the bottom of the tank. Will swim up and attempt to eat but doesn't seem to be eating much. Did a water change just in case. Then fed it a smashed pea. It now has this long string trailing behind it. Any idea what's wrong with my Molly?