I have a newly acquired 55 gallong acrylic tanks that's roughly 19" deep by 36 inches wide. I have two t8 light fixtures I could use, or I could use the 4 bulb t5 HO unit that came with it. Being that from what I read Discus like low light situations I figured I'd go with the T8 fixtures. They take 18" bulbs. Any suggestions on a particular bulb I should go with. I believe Discus go by the 1 watt per gallon rule, but if I'm wrong correct me. I want to put this tank together right. All tips are welcome, thank you.