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Glass Catfish - missing tail fins and barbels
I was wondering if anyone has had experience with glass catfish and an answer for why mine have all lost their tail fins and barbels. I've had six of them for many months now and they all look very healthy otherwise, i.e., no splotches, no ich, normal behavior, eating well, etc.. They live with mostly other varieties of tetras (neons and x-rays), pigmy Gouramis, mollies, two Plecos and a yo-yo loach but I've never noticed any of them bullying the catfish. And I've never noticed the catfish sparring among themselves. They live in a very sparsely populated 72g tank that receives frequent water changes and has an excellent fluval external filtering system. No ammonia or nitrites and my nitrates have never been above 10ppm. Water is hard and pH is 7.4. Any thoughts?
Thanks very much-
It would seem that some fish is nipping them. You have several "possibles" for this. Either tetra species, pygmy sparkling gourami, loach (being alone), and pleco; not sure about molly. If you really see no sign of any form of chasing during the day, it would seem to suggest a nocturnal culprit which would point to the pleco. I know these can "attack" other fish they take a dislike to.
The loach is a social fish and needs a group. Alone they can be highly stressed. Tetra species kept in less than 5 will often become aggressive, or if they are otherwise stressed by space, water, whatever. Sparkling gourami males when spawning (= protecting the eggs/fry in the bubblenest) can be very aggressive to any fish that approaches their "space," being the nest area. These are all generalities, but possibilities. If I could observe the interactions for a time I might spot something more definitive.
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