Copella arnoldi

[Hague1982]

Hi I've a very attractive quartet of Copella arnoldi swimming around in my community tank. I've a slight concern as their stomach is swollen, Is this me over feeding them or something else more worrying?

 

[Mike Wise]

I really can't say. I've seen similar after pencilfish swallow a comparatively large pellet, but this always disappeared as it was digested. Is the lump always there?