I purchased my little Mushu, a dumbo half-moon, about a week and a half ago. When I got him, I noticed that his fins were a just a little torn, but as these pics show, his tail is now very torn. He swims well, though not as well as my other half-moon that has normal pectoral fins. He only has live plants in his tank, though he does like to hide out in the little house. I re-homed the baby platy that was in there with him. I did a 50% WC yesterday. He lives in a heated 6 gallon section of a 20 gallon tank.
I'm worried he has fin rot. What do you think?