I would guess that you could heat the 1/2" tubing (dip the end of the tubing in microwaved water for 10-20 seconds) to stretch it over the 5/8" barb.
As I live in FL, I always debate whether I need a heater or not, so can't help you on the sizing of the heaters.
46g bf, XP3 w/ vertical spray bar, CO2 w/ SMS122 & diffuser,100% Flourite, 96w+55w cf AHS, AGA Member
Last edited by BSS; 01-28-2007 at 02:42 PM.
Reason: clarifying words