Orange/red? hmmm. I know it is a monti but you could go with a big chunk of Setosa. Mine is getting large and really provides a lot of red in the tank, then the colony of superman monti also gives lots of red. For Acro's you could grow some red planet in high light, mine turns very pink when it is in higher light, actually, hell, if you want red, shoot me a PM with your email address, I have a neon red mille that came in wild from down under and looks awesome, just dont have any pics here at work :O(
as far as yellow, cant help you mate, I get my yellow fix from the pink lemonade tips and yellow pocillopora. Good luck!\
edit: oh, also, orange cap, but man, you dont want to put that in there, I cannot get RID of it. Grows like a weed and I have orange anywhere, hold out, stay strong, and get an orange acro not a monti cap!