I'm not sure if I should worry, but hopefully someone has seen this before. My GSP Chopper is sitting on the bottom (which he does in the morning) of the tank with 2-3 little things coming out of his bottom. Looks kind of like white pearls

I assume it is white (I have a black light that turns everything white or clear, a greenish color) and it looks like perfectly rounded balls. He has his white belly, eats like a pig (clams on the half shell, shrimp and as many ghost shrimp as he seems to come across) and I did a 15% water change yesterday.
Tanks is in its final stage of cycle (I think....)
PH- 8.2
Am- 0
N02 - 0
N03- 20-30 (difficult to determine exact color, but has been coming down from 40 when it was at the highest)
The only real changes in the 10 days they have been in this tank was adding about 20 fake plants (which I soaked & rinsed in very hot water). May have stirred up some gunk, but this was 5 days ago. Other 2 puffs are doing good. Thanks for the help!
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