I just noticed this on my pleco this morning. Sorry the pic is a bit blurry. The best I can describe it as is a bloody bubble. It's hard to tell in the picture but the bottom half of it is bloody and the top half is semi-clear. There is also a smaller one to the right of it developing. The tip of her tail looks to be getting it and she has red coloration from the dorsal to her tail. She hasn't eaten anything and has been sitting in that same spot for about 24 hours. Seems to be breathing normal. Tested the water and it's reading normal. 0 ammonia and nitrite, nitrate 10ppm, temp. 76F, PH 7.0. This sucks..any ideas?