I think he has eaten too much.... I am pretty sure thats it. I fed him a lot of snails, about 8 and he gobbled them up this morning, then about an hour ago I fed his tank mate some Brine and bloodworms and he ate most of that also. So I think he over ate... Is that a bad thing. He is definitely an eater...
Tucker, my ex GF's baby GSP, did that to himself now and again when he managed to run away with more than his share of the food. He'll be fine, just make sure he doesn't' get that much regularly.
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My Puffers: Puffers I have kept: T lineatus T miurus A modestus T biocellatus C valentini C coranata C papuan C lorteti DPs suvattii burrfish T niphobles