I am setting up to 80G 48x24x18 frag tanks. I am going to keep sps in one tank and lps/softies on the other. I already have a set of xr30 G4 pros for the sps tank but I am thinking about if I should do 2 xr15 G4 pros to save money over the lps tank or if I should just spend the extra $500 and do 2 xr30 G4 pros. Any input will be greatly appreciated. The display will lighted by the radion xr30 G5 blues on the AB+ schedule. Thanks for the time in advance.