This light probably wouldn't do so well on a 90g eh? I'm not looking to keep sps or clams, but maybe a nem would be cool... Would I be better off getting a 6 bulb unit?
Benny for an anemone you'll want at LEAST 6 bulbs. That's a VERY HIGH light requiring animal. Honestly you'll want to get as much light energy as you can down into the water on that tank buddy.