I am new to owning green spotted puffers. I have 3 in a 35 gallon tank. I am not sure of the water ph and other information at this current time. I have to test it but in the mean time I am hoping someone can help me. One of the three puffers seems to be puffed and when I think he is going back to his normal size he gets a little more puffed up. He hasn't eaten today but he isn't rubbing himself on the gravel or anything in the tank so I don't think it's ick. He also isn't swimming that much until I go near the tank. What can it be? The other two fish are completely fine.