07-08-2012, 07:17 PM
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This is a behaviour I have observed with all of the species in Carnegiella (which I have) at one time or another.
Generally, it is a sign of stress when it occurs with Carnegiella strigata. As someone mentioned, this can be expected initially, and I have had some fish that will dive down in the tank for several days. I just leave them alone, to avoid further stress, provided I can observe no aggression from other fish toward them. Mine will often do this during water changes if I am crashing around inside the tank.
Having more would help, as this is a shoaling fish and I find they are much better in larger groups, say 9 or preferably more. When you next see them available, acquire more. In the interim, observe and unless something is an issue, let them adjust on their own.