It's for a Evolve 8, about 6.6 gallons in the viewable area. I plan to grow everything. I'm leaning towards the Nano since I already run a AI Sol Blue on my Solana 34g and have the controller. The Zetlight is compelling though and I'm wondering maybe if the AI Nano is overkill for my small tank. It's 300% the cost. I wish there were some more direct experiences people can share. I've only read reports of possible growth although some not so great coloration.