Odd thread title I know. I've got an up and running tank, with coral already in it that I'm considering making plumbing modifications to. If I cut some of my drain lines and rearrange them a bit, how long would you leave the cement cure before firing the system back up again? I know guidelines on the cement itself is something like 15 minutes before pressure testing and a couple hours for a full cure, but would you trust your coral to that?