I would get an workhorse 7 ballast($45) 2 sets water proof endcaps($18) 2 uri bulbs 1 superactinic 1 marine glo ($45) for a grand total of $108.00 you get 220watts 4wpg, with decent intensity. Provided good water quality and weekly feedings of silversides, krill etc... you could keep a BTA, and some softies.