Why is the skimmer off? You will want to maximize water circulation within the tank, making certain that there is good movement throughout, and at the surface.
It would be best to get the nitrates down. The symptoms of your puffer seem more like stress, either environmental or nutritional.
I would suggest another two water changes, every other day.
It would be best to get the nitrates down. The symptoms of your puffer seem more like stress, either environmental or nutritional.
I would suggest another two water changes, every other day.