Oh gotcha both of those lights are very nice!Like i said there are other options but I can say it definitely grows lps and soft corals. But I think there are much better light options there aren't many better programming options under $200. Also the 29 gallon is a little deeper tank. I think it would work really well on a 20gallon long. I will eventually upgrade it to an AI prime 16HD or a kessil aA360 probably next. The light was given to me so I figured no reason to spend $200. It was new though. So not used.