I have had a black moor and a calico telescope for about 7 months in a 55 gallon tank which I clean weekly 50% water changes. I have 2 Fluval 70 gallon Hobs and my ammonia and nitrite are both 0. My nitrates were higher than I would like(around 60) so I added a pathos plant to each filter which has helped my levels. I also have a bristle nose pleco sharing there tank too. I have some pieces of solid drift wood with some Anubis growing out of it and some larger pebbles in the bottom. I also have a green machine since my tank gets quit a bit of indirect light from some big windows in the room. I thought that maybe black jack (my black moor) had bumped his eye when I first noticed it, but there is this weird air bubble looking thing I his eye as well and it looks like there is a little bit of blood in his other eye now too. Could this be an infection, and if so how did he get it. Have not added anything new to the tank for quite awhile. He is not acting sick in anyway and eating well. Should I be concerned? Thank you for any help you can provide.