Okay, I bought 2 gsp's a few weeks ago, and I've been slowly working my tank up to a brackish set up. They are both a little over an inch now, in a 46 gallon tank, ac110 and ac70. Tank was fully cycled when I got them as fw, cause that's what the lfs keeps them in, SG is currently at .008. Ammonia 0 Nitrite 0 Nitrate 10. I was thinking the puffer looked like he had 'puffed' and was stuck that way and then the next day he was dead 
Anything I should be worried about for the remaining puffer? He looks fine to me, but I'm new to these guys....thanks.
Anything I should be worried about for the remaining puffer? He looks fine to me, but I'm new to these guys....thanks.