I'm well aware ge silicone 1 is critte safe, but my question is can it be applied underwater and cure? The tank is going thru a cycle and there's no fish in there now. But one of the loc line fittings came undone from the bulkhead to its not really a stress point as far as tank stability. So can I just dab some silicone on the fitting and put it back into the bulkhead or do I have to drain the tank first?