Lighting For Nano
I have my 175W over my 20g (I know ... not a nano, but a "mini" I suppose) at about 3"-4" over my surface. It is an open top tank however and it is a suspended pendent (I can also raise and lower it as needed) -- so heat isn't an issue. If planning to go with a canopy, that's a serious heat sink and I'd either have it higher or have a fan (or both) in such a case. HTH..
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