I just want to bang my head!!!!( dead MHD)

I got about a month ago a mountain horned dragon. I had him in just a tank but then read they needed lots of air flow so I bought a tank topper. He had been not doing well in the normal tank and turned dark brown.He lighted up in with the tank topper. He refused to eat so after a 2 weeks I forced him to eat a few butterworms(rubbed it on hid nose). He was doing better for a few days( eating,drinking,moving,good color) and I though he was all better but I found him dead! GRRR I'm never buying WC again!

:( Sorry for your loss.