I have a 6 ft long, 125 gallon and recently added two 3 ft, 4 bulb (2actinic, 2 12k daylight) T5 units with blue LED moonlights. I also have a single row (2 x 3ft) T8 50/50 light along the front (this is the only light I had for quite awhile). I have slowly added xenia, yellow star polyps, several types of mushrooms, cabbage leather, torch, toadstool mushroom, derasa clam and a couple other low light critters. All are doing well and show signs of good health.
IMO the T5 lights are great!