Hi Roger, I apologize in advance because you already answered this once for me. I am having a 75 gal. built, 30 x 24 x 24. I have only softies, LPS,etc. You previously recommended a 7200- 7300 for me. Do you think there is anyway i could use a 6000 as I would like to try my hand at some SPS and make this a mixed tank in the future. Or am I asking for trouble? Of course, I don't want to blow my current animals away, however, I hate to find out later my flow would be inadequate for SPS's. Of course, I won't have much length to work with. Thank you very much.