I can't set up my 240 until I get into my new house don't trust this apartments floor. I got a 90 so realistically he would only be in it for a max of 6 months.
55 is fine for pups with adaquate filtration. All new pups I have gotten go in a freshly setup 55 for a month at least before going in larger systems. Never had any issues. Just stay up on WC and dont let parameters go to crap.