New 90 gallon Swim Tank

[doveshaq]

I am setting up an aggresive 90 gallon tank and would like some advise. I have had several nano-reef tanks, but never have tried a swim tank.
How much rock should I put in there and what kind?
How much sand?
I have ehime pump and a regular lighting system. Should I get a protein skimmer?
Thanks.

 

[xxxgreg]

they say 1 or 2 lbs of lr per gal and ill let someone else tell you on the sand ive never been a big fan of it .imo yes you need a protein skimmer