How many watt is the light, does it have lens, if so what's the angle and what's the height of Cresent 5G
I tested Fluval Spec at about 12" from bottom. Stock light(2.1+ watts with out lens) will keep low light plants only and sometimes a little deficient. You need 4x1W with 60 degree lens to keep almost anything. However, the tank is too short so the center is slightly too strong. I will test 4x1W 120 when available and let you guys know. I believe 90 degree is the best for nano but so sad, I cannot any 90 degree lens.
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