water displacement

[hookedonreefs]

Read lots, but I have a question about actually setting up. I've filled my tank to almost full, filled it with sand, and left the sump dry. I'm getting ready to buy LR and add. Question is, should I completely fill the tank and sump first, then remove water for displacement as I add LR? OR, should I leave it as it is and let the displacement fill the sump fiinally topping off whatever I need? I'm sure I could go either way, but I'd like to know the easier of the two ways. Thanx

 

[goldrush]

Depending how much LR and LS you add,the displacement should fill the sump. Now is a good time to keep track of exactly how much water is in your "system".This will come in handy for figuring doses of suppliments.

 

[broomer5]

Doesn't really matter ~ as long as you don't fill the sump all the way full.
Personally ~ I'd drop the level in the display tank - add my rock - fill the tank to just shy of the overflow - then begin to add saltwater to sump and concentrate on getting it's level right .... which will depend on your individual set up.
Test for powerloss/draindown/siphon break ~ make any corrections ~ and fire that baby up !

 

[hookedonreefs]

Thankx
I already marked sump at the optimal "no-power" water level when it was full with tap water. The water level is currently just below the overflow line in the main tank. I figure if I "throw" 80lbs. of LR and about 20Lbs. of ls (to seed to SD sand) then it should almost fill the sump. It's tough, since I don't know the denitsy of the rock, I can't exactly calculate the displacement of the water.

 

[slick]

Like you said either way will work. I think I personally would let the displacement fill the sump. But thats just me.