Taking a sump down isn't that big of a deal as long as you can move whatever you need up to the display, like the heater, and keep anything wet that needs to be.
I would be concerned about what you are using for CO2
exchange as it sounds more like a bubbler than an actual powerhead. This can cause salt creep and isn't very effective. If the only movement in the tank is coming from your return of the sump, you really need to invest in a powerhead so you can get co2
out and oxygen into the system. Though it is only 24 hours, I'm sure things will be fine until you get the sump back up and running...it is more of a long term thing that will need addressed.