If your tank will be almost all SPS I can recommend these pumps, otherwise I would suggest you use a 7310/2. I have been using one in a 58gal for testing and it is a bit much for some of the LPS and clams. Of course you can play with positioning and make it work. I would not use anything finer than 2mm sand though. If you can get the Electronic pump, the pulsing will help keep the flow from being too unidirectional. I know it is alot more but perhaps you can shave off some money from somewhere else in your set up. Preordering is up to the vendors, I think it is too soon right now but I will try to make you aware the day I get positive confirmation they are in production. We are having some problems keeping up as it is and I don't want to start another mad rush.