sounds like the ram that is getting very red and colourful on the belly is a fire-mouth ram which has settled into its surroundings and its true colours are showing, it may be that the tube you refer to maybe its "poop" that looks like a tube, the ram laying down and not moving tho sounds as if he isn't too happy and may not be doing as well, i have had 2 ram that displayed this action of just laying on the bottom then retreated to a hidden area to be found the next day no longer alive. I hope however this isn't the case for you !!!!!!! and is just a lazy ram, ive never seen ram or had experiance of their breeding habits but this may be a habit to them.
Scott.