Well I have had both my tanks for a year, but I am planning this anemone for a 10 gal tank, and I was recommended to buy a T5 light for it. My maroon hasnt been growing very much if at all during all this time. It's very small, around 2 inches. I am hoping for it to decide to be a "woman clownfish" and finally grow up but my little guy refuses. I enjoy having one small tank. Its easier to keep it, to maintain the same salinity there, its easier to see all its inhabitants, its much easier to feed. The big tank has its big advantages too of course.