I don't think he's getting fat. The inflating comes and goes and his tail is in the submissive position. My Red Tail Black Shark and Bala Shark are bigger but they don't mess with the puffers. I don't see then hassling each other either (the puffers).
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55 Gallon Freshwater
Black Red Tailed Shark
Bala Shark (small will trade him when he grows)
2 African Dwarf Frogs
2 Clown Loaches
1 Pea**************** eel I never see
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