Harlequin Rasbora - Constipated?

steve2010

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I read elsewhere about a constipated Harlequin, and realised that I've never seen my harlequins poo! (Compared to the guppies I had which poo'd more than I did) And now perhaps this explains why one of them is getting quite a "belly" on him!

The fish were added to a partially cycled tank, though the ammonia levels are decreasing now, at about 0.25ppm. Nitrites are zero according to my tester, and nitrates are at about 30-40ppm.

Is a big bellied harlequin normal?? He swims perfectly normally - darts about with the others, eats normally etc.
 

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