I am in the process of setting up a 20L as well. When I had other tanks with pc lighting on it 2-3'' above the water the lights put off to much heat. For this 20L I am using a T5 4x24 retro kit that is 24" and I am going to stagger the bulbs inside the hood. Also I am thinking of running skimmerless for a little while. My tank is going to have a 10g sump/fuge attached.
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