I have attached 3 pictures... My oldest Pleco is the top picture. Her chest is caved in despite being fed enough daily. Second picture was my male who recently died assumingly due to bloat and the bottom picture is of my Pleco I noticed literally 2 minutes ago - I know the tank needs a clean.... It's tank cleaning day tomorrow morning :/ I had 7 plecos at one point and I am now down at 2 and have no clue why!!!!! I have treated them for internal parasites and one of them still dies?! I'm absolutely at the end of my tether and devastated cause they keep dying and I am not buying any more until I can get this sorted! No other fish have died, just my bristlenoses any ideas would be brilliant because I just don't know what to do anymore! My lfs has no clue either!