I have a clown loach that has started acting very odd. Over the last week I noticed that it was never coming out of a cave so today I moved the cave out of concern. It seems to be very sick but I have no idea why! The other loaches in the tank are fine (4 of them) The water parameters seem fine all fine and the pH is sitting around 6.8. No new fish have been added in over a year. Now it is doing a very awful thing, it is floating agains the intake of a powerhead! Its mouth seems to be rotting or something horrible. As it i my largest loach I am clearly heartbroken and hope there is something I can do.