
I need a little advice!

I have just received a Galaxy/Vampire pleco sized at 3in from shipping and he/she is residing in a 5 gallon quarantine tank provided with driftwood. I was just wondering if it's a good idea to keep him in a 5 gallon for a little while until he grows a little bigger 6in-8in? For a large 250 gallon with 1 Silver Arowana tank and plent of other cichlid and large fish. My large 3' ft Arowana seems to be very peaceful. In the tank, he does not attack my 1' ft pleco nor my 4-5"in red blood parrots and silver dollars...
Eh, I was wondering if it's even a good idea to introduce such a small vampire pleco to the tank? The problem is, do you guys think the arowana will eat the small vampy pleco? Or it's fine? The arowana will not bother any pleco species?
Oh yeah, what's the best food out there to feed a large common pleco anyway? I think pleco is starving because it hasn't ate in a while; pleco is only feeding off diatoms and some algaes.
