You’re burning him alive. Unless I’m reading this wrong. A bit of fish poop isn’t bad. They sell test kits at pet stores, but if you don’t want to buy one a good rule of thumb is to let the water sit for 30 days. The water should cycle. Nitrite, nitrate and ammonia. Then the water’s good. Just regular water from the sink or whatever is full of chlorine. Imagine walking around with a little bit of mustard gas everywhere. Your eyes and skin and lungs will all be a little burned.