I have a problem arising on my hands. My betta is dying and I don’t know why. His fins are ragged and run through, he doesn’t see his food and misses it a lot, and he constantly rests, never swimming around the tank like he used to. Please help. His symptoms have been progressing for a while, but it’s gotten bad. I’ve tried salt and medicine but that doesn’t work either. He eats well, despite missing when lunging, yet he looks thin. I’m worried. The tank has not changed. The parameters are the same (ammonia 0, nitrite 0, nitrates 20, ph 7.5)z please HELP!!!