Good luck with your puffers. Mine are already very entertaining! I keep them in my office tank so I can watch them during the day.
Most likely the problem is water related. I would suggest 50% changes until he perks up.
As a puffer owner I will happily take contaminated grass
I will like some crayfish and snails if that possible
2750 west 33rd street apt 2144
I would agree that most of the waste is probably in the substrate. Because you clean so often most waste is probably just removed, especially if you vacuum