adding t5 to my lighting set up

[collie man]

im looking to add two t5 bulbs to my CADlights MH/T5 combo light. I just want two more t5's so i can get more color. I already have a 150 watt 20k with two ATI Blue +'s over my CADlights artisan cube. Im trying to get more color out my SPS so im thinking of adding either purple + or true actinics

what should i do?