Hey jsoli4 iv got a 600l x800wx600 deep tank and running the same unit iv got the 60 degree lens on it the penetration right to bottom is nice but the spread is not to wonderful having a lot of shaded spot if u got rock formations, I would say a tank of 500 x500 is ok for this light I haven't tried the other lenses tho. Im running 4 t5 tubes with my led and that works nice.I mount my led with the brackets that fits on the sides of the tank and than my water level is a another 5 cm down ,I think u can work on that level of hight.On the positive side I love the royal blues on this unit I only run them in the evenings and the colours look amazing.