Shallow tank and Evergrow It2040 question.

That seems like a lot of light for that size tank.

That said, I would think you'd want it around a foot so you get enough spread. Intensity isn't really going to be an issue since your tank is only a foot deep, so I'd come up with something adjustable to hang it and experiment a little bit until you're happy with how it looks. In this case since you're going to have more than enough intensity it's more about managing light spillage and spread in the tank than anything else.
 
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