My shubunkin goldfish has recently started acting different. He eats very well and I have checked all water parameters and they are normal. He likes to “freeze” in the middle of the tank instead of swimming around. Hell swim to me when I approach the tank and he is eating normal and for a couple hours after feeding he’ll pick around the tank for additional food but then go to his “frozen” stage. Anyone know why he does this? I’ve attached a photo of what he looks like in his frozen stage lol