i have a frogspawn that 1 shoot died as soon as i got it now that shoot is turning dark brown the other 2 look ok but the body looks like its gettig darker

Sup, so my frogspawn is mostly dead now (I lost about 5 of the 8 heads of my frogspawn) and one of the heads started detaching and now its on the bottom. So problem is this, I tought that it would on the bottom and get eaten by wathever is going about down there. But it dosent seem that its...