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A lot of people on here use taotronic LEDs including myself with good results, if your tank is 18" wide by 24" deep it sounds like a 20 goal long extra high which would easily be lit by a Tao
A lot of people on here use taotronic LEDs including myself with good results, if your tank is 18" wide by 24" deep it sounds like a 20 goal long extra high which would easily be lit by a Tao
One Tao unit should do great, if you plan on keeping that tank and not upgrading later you could order one with 90 degree lenses, if you do plan on someday upgrading to a larger tank I'd go with 120 degree lenses