The tank is a 120g 48 x 24 x 25. I have a diy LED setup with a 3 : 2 blue to white mixture of CREE leds, all on dimmers. The acan, plate, favia, candy cane, and blasto I have in the tank for about 6 weeks are all very very happy. The Candy cane is about 16 inches from the light, while all the rest are 20 plus inches. For flow I have two seas swirls off of my returns, and two 1400 gph Korolina's. So I would classify the tank in general as low to mod flow with one or two areas of high flow.