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i have to get back to work ::) so i'll leave someone else to provide in depth answer - tuning two 9.5s (one for each return) is giong to be difficult. better off just having one pump for both. Also there is no hard and fast rule regarding a single return pump with manifold - or a smaller...

In teh event of pump failure - the tank will not implode. Most of the in habitants do not rely on the sump pump for flow - hopefully you set up your tank such that the bulk of the flow is coming from the powerheads. A powerhead consumes far less electricity and you can set up a battery back up...

another thought - people always set up mixed reefs. What I mean is this: Person gets a SPS cap, then a LPS Frogspawn, then a sun coral, then a gonipora, then an anemone, then a scallop/christmas worm, then maybe a sea hare. You have filter feeders, moving stingers, photosynthesis needs...

to power the returns? an alternative to consider would be to get an external pump. A pair of 9.5s will definitely heat the tank a few degrees. Not that I would push you in this direction - but why two 9.5s instead of a single mag 18?

by the way -when you are ready to set your tank up and make the leap from cichlids - start a tale of the tank thread - then we can all follow along and provide tips/hints etc. In terms of best value from a powerhead perspective - i think the tunze appear to retain their value relatively well...

I think Mags are pretty reliable for the price paid. I guess it depends how much they are asking for. One downside with mags is that they do impart some heat into the tank. I've also noticed that long term use causes the screws in the pump to rust. Or maybe that was because I was negligent with...

i think ds4x4 uses that salt brand. He likes it. I think phyl does not like that brand - I forget why. I have a bucket in my garage...haven't tried it yet. Any particular reason why you want to use a new salt?