I have this black skirt tetra whose stomach is very bloated and he is breathing very fast. I found him this morning lying in a corner. I decided to quarantine him after the other fish started to disturb him and pick on him. Now, in his qt tank, he won't move and he's still breathing rapidly. Is this dropsy? I've been looking for the pinecone scales, but can't tell if he has them or not, cuz he's not coming to the surface. Is there any medication or something I should do? Also, i don't have a heater for my qt tank, just a sponge filter. I'm ordering one now, but it won't come for a couple days. Suggestions? I'm considering putting my main tank's heater in the qt tank at night, but in my main during the day.