For my 75g I plan to get two Workhorse7 ballasts off ----, $40/each, and then four 4' 110w VHO bulbs (2 50/50, 2 super actinic) off of prem aquatics.... or maybe 'rine depot. Get the endcaps, one pair for each bulb, make sure they are waterproof. German endcaps are the most used for waterproof I...