Lija,
You want it to be fairly bright down at the soil. It sounds like you have the Same LED system I do. It works and things grown, but t seems a bit Dim (I have mine on an 18x18x24). I am going to give LED another go on my next tank, but the last 2 tanks I bought T5HO lighting and the plants are going crazy. I have already had to trim the Mantella tank once in less than 2 months! Though that could also be because I have started to spray fertilizer on the plants every 3 weeks.





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