How many XR30WG4Pro's?

You may want to look at 15s instead of the 30s to allow for more coverage ... I am considering 4 on my 4ftx2x2 and its mostly softies and lps but I have a pile of BTAs that im sure will appreciate the light
 
I have the exact same tank dimensions and have 3 of the 30's. I only have to run them at 20% to keep my torch happy (only coral at the moment). I'm sure I will need to increase as I add more (predominantly SPS) corals but they provide excellent coverage even at the 29" depth.
 
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