New to reef...need some advice

[CRAP! Another Hobby]

Howdy!

We just set up a 55 gal tank. Bought some LR from a local reefer (thanks Trix ) and aquired a protein skimmer. (we will be adding a sump soon)

I know from years of FW discus keeping that once some "mature" filter media is in the system, that there is minimal/no cycling time needed. Since all the SW and reef stuff is foreign to us, I could use some friendly advice.

How can I test if the LR is ready to accept a bio-load?

Is it sufficient to have 2 hagen 802 powerheads (400 gph each) for water movement? Do I need more water movement?

Any and all advice is welcome