Blood worms and flakes. And do water param now and he never goes near heaters.What are u feeding it? Do u have an exposed heater? Water parameters?
The nitrate is really high. And it's because my sump likes to collect poop and all underneath of it and in the over flow sides and it's hard to clean. I'm going to do that tomorrow but for now I'm going to get some stuff to help the nitrate until then.Make sure water is clean and adds salt but for half the tanks size. Is the heater covered? In case it's the heater keep horizontal and at the top of the tank.
I only use prime for wc and I have to fix my filter to help my nitrates.Get some rid-x as well. Or look into it as part maintenance. Get those wc's with prime in as it'll help to heal up ur ghost knife in no time.