Oscarguy you said pacu right? Oh c'mon man, don't you know that your pacu is going out grow your tank in a year or two? It'll dwarf your fh and maybe even try to eat it. If you want something in with the fh, get a female for it if its a male.
Oh and yeah, my advice, get rid of your fugly pacu. It jus a waste of tank space.
Don't know how many of you agree with me but its just my 2 cents.