Skimmer & return pump off for a day?

[planedoc]

I'm concerned about O2 problems when my pumps are turned off.
I built a new sump and I want to swap out my old on with the new one. I have to redo a lot of plumbing.
Normally my ph high and low is 8.2 at 8 pm and 7.95 at 10am. I'm hoping I can get this done in 8 hours and have pumps up and running but it could take 24 or more hours. I'm never ran my tank with pumps off so I don't know what will happen. I have a 240 gallon with 4 tangs(all about 4 inches) 4 clown fish, 4 chomis, a flame angle a lawnmower blenny and a diamond goby. I have a few corals like toadstool frogspawn, zoas and a large torch. Normally I run 2 power heads at a time rotating every 15 minutes to circulate the water but since return pump will be off I'm going to run all 4 until sump transfer is complete. I plan on letting glue on pvc dry for 4 hours before turning on pumps. Should I be worried or not.

 

[greech]

You should be fine with the added water movement from the 2 extra PHs. Just make sure you have enough surface agitation.

You don't need to wait that long for PVC glue to cure. I have run water through pipes (live stock in tank) as soon as 15 minutes after gluing pipes together. The smell worried me but I had no issues and have since talked to a few local people that have run water through there pipes only a few minutes after gluing.

However, if you have recently applied silicone, you should give that 24 to 48 hours to cure before you use it.

 

[planedoc]

I've done one or two joints and only waited an hour. Since I'm doing 10 or more I might wait a little longer. I'm not worried about strength just chemicals. Silicone in sump has been cured for over a week so I'm good there. I'm feeling pretty good about it, if anyone else has any input don't hesitate.

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