Scleromystax barbatus Missing Fins

brentling

AC Members
Aug 1, 2008
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Lexington, Kentucky
I got a group of a dozen Scleromystax barbatus several months ago from a kind person on these forums. They were all juveniles and I am quite happy to have them. Here's what's up:

4 or 5 of them have grown quickly and taken on coloration. I assume these are males. They appear to be super healthy and happy.

The rest are still pretty small with the same coloring they came with and seem mostly to have lost fins! Some tend to briefly lay on their sides (missing pectorals), while others have missing dorsal fins. Some seem to have one pectoral, others have none. Most all of the little ones have the bottom half of the "V" of their tail missing too!

Water conditions are perfectly fine. No excessive ammonia, nitrites or nitrates. The fact that many of them are doing great tells me water quality is not the issue. I am using Turface as a substrate and the fish's barbels are all in good shape, which rules out sharp substrate.

My assumption is that the males are harrassing the females. They are in a 10 gallon planted tank. This is/was a grow out tank before they go in my 125. They were just wee tiny juvies when I got them. Any suggestions? At this point, I think I will move one group or the other into the 125. I'm not sure whether to move the small, unfinned ones, or the larger finned ones, though. The 125 is heavily planted and has just finished cycling. These would be the first fish in the tank... Suggestions are appreciated.
 
The colored up ones are most likely males.You did not mention how long you had them.12 in a 10 gallon is over stocked. A pair should be in a 15 gallon 2 pair a 30 long.The males are aggressive and territorial.
 
Yep. According to www.planetcatfish.com
Ideally this species should by kept in pairs, the males are territorial. If there are two males in a tank that is not large enough to give each his own space, then squabbles will occur. As the spawning season nears, usually in the early part of the year, squabbles will often turn into real fights where serious damage can be inflicted; death of the weaker individual is not out of the question. A standard 24"x 12" tank would be sufficient for one pair; two pairs would need at least a 36"x 15" if not larger.
 
Yes, I read that as well, which is what caused me to think that might be the problem. They were tiny babies when I got them and were not overstocked in the 10. They've been in the tank about 90 days or so. Largest are 1 1/2". Smallest are 3/4". They are going in a 125 once the tank has finished cycling, etc. (which it has).

The weird part about this is that the larger, colored up ones (assumed males) are all fine. It's the smallest of them that are having trouble. Thanks for the replies. I had about given up on this thread...
 
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