I seem to remember something about Red Cell not
being worth the $$ or effort.
I would suggest using the gastro gard to repair
damage and that will probably help him heal himself. Also, I probably just
missed it, but what worming have you done so for. Parasite infestation and
ulcers can both contribute to anemia. Fix those and you should plug the
blood "leak"
Good luck with your project horse. He could
end up the best horse you have ever had.