Your tank should be alright running with just powerheads until the silicone dries. I'd just make sure that there's one rippling the surface for oxygenation. There are nitrifying BB on every surface of the tank and will help until you get your sump back up and running.
They asked me to move because I was blocking a fire exit.
If you're flammable and have legs, you are never blocking a fire exit. -Mitch Hedberg