that water starts dying quick if it isnt circulated, and the ph gets dangerously low.
This is of course more or less important dependiong on how much pipe you actually use for your CLS.......... But if I shut my closed loops off for more than a few hours I dump the lines before I will put it back into the tank.
OCD a little........yes, but just the same, for kicks while not a bunchof animals are in the tank........go ahead and shut it off for 6 or 8 hours...then crack one of your unions by the pump and smell the water.
If you dont have rock and water flowing you of course cant do this......im not sure if you do or dont yet....need to go look at your build thread...
I bet you wont consider shutting off the cls on purpose again
