Originally Posted by FuelingFire
Thanks for the welcome from all of you. and i think what i will end up doing is finding fish around his full grown size that will maybe have his personality to maybe keep them at bay. though it's a thought it isn't definite.
Not sure I am interpreting you correctly, but if you mean selecting fish with similar dispositions, that will make everything worse, as those fish will cause trouble among themselves regardless of the RTS. Very generally, having a RTS means no other substrate fish, as these will almost certainly invade "his" (or "her") territory regularly. As for upper fish, remembering the RTS attains 5 inches, they should be substantial. And no stripes which frequently antagonize the RTS. The medium barbs (but not striped) and medium-large rasbora tend to work.
As i mentioned previously, each fish can be different in temperament, so while the aggression is the norm for this species, one does come across individual fish that behave a bit more docile. But you should understand the probable risk and plan accordingly. Getting rid of fish later--whether to another largish tank, or the store, or other aquarists--is not always as easy as it sounds.