Porcupine Puffer Problems
I have a 135 gallon aquarium with about 100 lbs of live rock; I have a 5" volitan lionfish, a 4" porcupine puffer, a 3.5" foxface, and a 1" damsel. When I measured my water parameters over the weekend, the ammonia and nitrites were 0, nitrates were 30, temperature was 76, salinity was 1.023, and pH was 8.1.
Over the last week or so, my puffer who I have had for a few weeks has become much more withdrawn. He is dark, will lay on the bottom most of the time, and hides behind the live rock. When I first got him, he was extremely social and at the front of the aquarium all the time. He is still eating regularly. I am feeding him and the lionfish a mix of shrimp, krill, scallops, and squid. I have had him about 3 weeks. His eyes are still iridescent.
I was gone for Thanksgiving for four days during which my roommate fed the tank inhabitants. The herbivores were overfed during this time, which caused an algae bloom. However, I have gotten that largely under control with water changes. The lionfish and foxface seem unaffected. My puffer did have a spat with the lionfish when he was first introduced (the lion was quite aggressive towards him), but that seems to have subsided.
I would love to have any suggestions about what to do for my puffer.