Thats still an over kill. Especially if ur just going with softies and lps. Even ur nova can support clams mid to high on the rocks. With good bulbs u can support sps and clams in ur 55. Are u running stock nova bulbs? If so het some good ones and ur tank will thrive and look WAY better. I'm telling u, a 4x54w can support anything u put in there, same with 2x150w mh. But both to much man.