Rock placement in tank

[Hbbambislayer]

When setting up a reef tank when you place your rock in the tank do you want the rock up against the back of the tank or space back there and if so how much

[Phranque]

A lot of people stack it up against the back, just remember to leave openings in the aquascape for fish to swim through, and to allow plenty of water flow through the rocks to avoid dead spots.

[Peixe]

I left about 3 to 4 inches of space btw back glass and rocks. Now, as u can see on my thread, I'm learning how to glue the to rocks in place so they can be secure, not hitting the back or falling...