
Hi, I put eight otocats into my tank about three weeks ago and they seemed to settle in fine, getting nice and plump and swimming freely around. When I looked this evening though I noticed one, and then three of them have very red mouths like they are bleeding internally. The blood appears to be all over their lips and behind the mouth running up to the gills. They are eating fine and are swimming around as normal but it looks nasty and sore. I am worried they are hurting their mouths on the gravel or even then sand which they have been syphoning regularly to get the brown algae out of it. Does that sound like anything anyone has encountered before? I am also worried it is/will get infected and don't know what infection I should be dealing with. Any help would be great, I'm very attached to them already.
p.s. I don't know if it would be connected but I have had to move one of the Lemon Tetras out to the hospital tank because he seems to be suffering from swim bladder disease.
p.p.s. I am confident the tank is cycled, it has been running six weeks with bacteria additives. Nitrites are in the region of 1, nitrates 0-10, have no
test kit for
ammonia, plant growth is strong, it's a 44 gallon tank and I do weekly 20% water changes.