go for t5s. ati blue plus along with a uri 75-25 or ge 6500, and maybe a uri super actinic(or 2). i am assuming the tank is 4 foot so each ballast could run 4 bulbs. you could put 2 blue plus with 2 super actinic(or equivelent) for the dusk dawn cycle and the rest come on 30-60 minutes after and...