Today when I fed my fish I noticed my porcupine puffer wasn’t eating at all and he wasn’t really swimming he was just kinda floating around and going in front of my powerhead and just kinda floating through that too. I have 2 clownfish, 2 damsals, and a sand sifting gobie and they all ate fine and looked fine. It’s a 55 gallon tank and we don’t use a sump filter we have a canister filter so I try not to feed the fish too much for less waste in the tank. My puffer eyes also seen clear they usually have little dots in them and I’m beginning to worry what should I do?