So I got a new balloon molly today because one of my pair disappeared a couple weeks ago and my 2 year old balloon molly got really stressed out by his appearance. He started acting weird (floating near the top, trouble swimming), got stringy poop, and now he looks to have a big bubble protruding from under his gonopodium. It is almost see-through. Any idea what it is and what I can do? I gave him a pea which he ate a couple pieces of in case it is swim bladder.