After receiving a snarky and useless reply to my question on one of the "big box" forums I figured I'd ask the polite people. What *can't* be grown under 4x 24" T5 bulbs on a 20g high?
Thanks said:
Not much can't be grown with that, but some of the higher light SPS might require altering your cycle time. The biggest challenge in a tank that size is flow and parameter stability. If you can tackle those successfully, the majority of coral will do well. Your SPS will be limited to the upper portions of the tank though.