Hi, got up this morning to find my elephant nose who,s my pride & joy with a white greyish mark on his eye. My paras are perfect 0 ammonia 0 nitrite 5 nitrate I clean his tank out every 4 _ 5 days as I know how important it is to keep his water clean. Gone & cleaned him out this morning to be safe. Could he have injured his eye? Had him for a few months now. Any advice would be great as I'm devastated