Hey guys I recently got a 3 inch rtc for my 100g about 1 week ago and I've been feeding him cut up shrimp and tilapia because he won't take sinking pellets and I've noticed he has been breathing heavy and fast like if he's choking the ammonia reads at 0 nitrIte 0 and nitrates below 20 I have a aquaclear 110 penguin 250 and diy wet dry trickle tower with a return rate of 600gph what do you think is wrong with him? Thanks for the help and also never leaves spot under pvc overflow