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If you have 56 watts over a 29G tank, that would be low light (1.93wpg). That is enough to grow low light plants, like: Anubias, mosses, crypts, horwort etc..
A 2 x 36 is 72 watts which would give you 2.48 wpg. This would be considered low-medium light setup. In this case you could grow a little more variety of plants.
A 2 x 36 is 72 watts which would give you 2.48 wpg. This would be considered low-medium light setup. In this case you could grow a little more variety of plants.
