what you could do is mist on some freshwater and that MIGHT help with the curing process, but you would probably be better to just let it sit overnight. Silicone uses humidity in the air to cure if I remember my chemistry class well enough back from when I was in highschool, so if you could increase the humidity that might decrease the cure time. I don't know what the effects would be of leak testing it before it has cured though, if the silicone is still sticky wet, then the weight of the water might move it and create leaks, but if it has already gotten pretty close to being cured than I couldn't see the harm and it might be good to do it before it cures 100% as you will be able to add more silicone to the spots that do leaks without having to worry about whether or not the new silicone will bond with the old stuff. One thing I can tell you for sure is that there will be leaks lol, I don't think I have ever got one perfect on the first try, except for an overflow box I did a while back, and there was very little places that needed to be siliconed...