I have a weather loach which I inherited about a year and a half ago. I don't know how old it is, but it's about eight inches long. It seems to be getting progressively worse. It looks to be very bloated. It doesn't move much, and often lays on its side. I haven't seen it try to feed for the last week or so, and also haven't seen it swim to the water surface to grab gulps of air, which has been a very common practice seen I've had it. Is there a somewhat common ailment in these animals which would cause this bloating? It's being housed in a 55 gallon tank with a small koi, a synodontis catfish, a couple of cory's, and another inherited cat which I haven't been able to identify yet. The PH runs in the low 7's, no ammonia or nitrites, and very low nitrate levels. Temp is around 72 - 73 degrees F. I do regular 30 - 40 % water changes because of the koi. I haven't been feeding the tank anything different. I am currently keeping 10 tanks (approx 400 gallons worth), and have kept fish for over thirty years, and I just don't normally lose fish to disease, as I've always been very methodical with my tank maintenance. Any thoughts? One last thing, all of the tanks inhabitants have been together for about a year, no recent additions.
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