I wanted to install a new surge device on my 50 for SPS. I have 2 65 W compact flourescent (1 atinic 1 daylight). The surge would use a toilet flapper and drain about 1 gal in 10 secs roughly. Can i still keep softies and more gentle corals atthe bottom, or will this be too much flow. I also have a 900 gal/hr pump running as main with 3 ft head. Can i do SPS & soft coralswith this setup? Any help appreciated. Chris