Jebao Wavemaker- what size for 120 gallon tank?

So I was going to get two Jebao WP-25 wavmakers for my 120 gallon, but I am wondering if one WP-40 would work for my 120 gallon (4'x24"x24")? Would one of the WP-40 be enough flow for my reef? I am keeping softies, lps, a few sps, anemones, and clam. Or should I just stick to my original plan? I am just thinking less money to spend in the long run.