Hey guys well I have a 20g high and I'm thinking of going back to leds preferably AI prime HD or the hydra 26 HD. My coral dont seen to be happy with my most recent setup ( 2 t5 ati coral plus + reefbrite 24" xho on about 20% about 12" from the water) my question is could I get away with 1 prime HD or should I go with the 26?