Let em rot. lol. Thos little parasite worms, planaria?, will take care of that.
I once had a dead shark, I don't remember if it was a bala or red tail shark but it had died and in 3 days it was down to bones. He was the only one in the hospital tank. I had his skeleton out on the tank for a while.
Had the crazy idea earlier to think about getting something custom built similar to what i remember...............but big enough for my RTCxTSN hybrids! Would look impressive, i'll wait for a lottery win first tho.........