whats the difference between t5 and t6 lights?
ive read that t5 lights penetrate deeper than PC lights, so I think im gonna add a 4 bulb t5 fixture to my PCs. Are t6's better than t5's?

currently have ric's, shro0ms, zoa's, trumpet coral, frogspawn, inverts, and some fish.

want to get an anemone for my clownfish, which would be better?

also. Have 4x65w PC fixture on a 75gal tank. Would a 2x54w bulb t5 be adequate, or should I get a 4x54w bulb t5? anyone know a go0d place for a nice deal on retrofit kits?