I would also say 6 as a good number.. I don't have any experience with them but most successful tanks I see have more than the manufacturer recommended amount.. I was planning on getting 3 for my 4footer fwiw(decided to stick with T5 =). .. If you don't mind shadows and you really do stay mostly softies the 4 might do it for you..
I agree with rtparty that you'd need a minimum of 6. You probably would want to do the radion pro to add that extra punch to 30" depth. Also like rtparty, I dumped radions- they were the worst led light that I had tried. I went back to T5, and now use a "better" led system
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