yes to both, assuming 510 connection...too my knowledge, all 510 cartos are of the same diameter and will fit all tanks...the XL cartos are simply longer. there are pics floating around of XL cartos on standard tanks floating around this sub forum somewhere.
i don't own a phiniac tank but i know that they are of good quality, as made of pyrex. i prefer ibtanked.com tanks as they are less expensive but of the same quality and IMO look better.