Is it a low tech set up? My tank has the same dimension as you except for the length. I'm using 15 watt for my 1.5 ft (30 litre) tank, following tom barr 1.5 to 2 watts per gallon rule for low tech planted tank setup but i heard that this rule might not apply on small tank. Anyway my plants are growing well, i have mini riccia, flame moss, mini nana, golden nana, mh and hm. Moss don't really require high light thus 12 to 15 watt will be fine![]()
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