Originally Posted by bavass
So this weekend I begin the planning of the 90g upgrade. I am going to go with all new sand. I have 100lbs of live rock but will be getting another 100lbs. Might make my own live rock? Not sure yet. What is the best sand to use for a deep sand bed I want to go 4"-5". What is a good main sump pump for a 90g? I was thinking the mag-drive 9 but seems that the corner overflows are only rated at 600gph in the All Glass Aquariums.
In my opinion, you do not need another 100lbs of live rock if you already have 100lbs for a 90gallon. 2+lbs per gallon is a little much and can lead to problem with flow/dead spots.
Look into the Caribsea brand sand, don't bother buying what they call "live" sand. I like the Caribsea Oolitic
For your return pump and that size tank I would go with an Eheim 1260, very reliable and quiet. Eheim Universal "Hobby" Pump
this is rated at 635gph, however you won't be getting 635 by the time it travels into the tank... it should be perfect for you. And it uses less electricity/puts out less heat than the Mag 9