I am in the process of taking down the 30 gal oceanic cube & setting up my 80 gal acrylic cube (Kimoyo-museum acrylics), i moved my corals to a 12 gal nano no sand & in 2 months the Tyree war coral has doubled in size. nano has 48 watts of PC & 30 gal 150 watts HQI MH. coral was on sand in the 30 gal & no sand in the nano. I know intensity of lights could have impact but 30 gal alot deeper than nano. Could the growth be due to a smooth surface (glass) as compared to a sand bottom. The war coral is spreading on the glass bottom. Parameters are the same in both tanks, same water.