How to test water flow?

[DazzleDiscus]

Hey all- 'Tis me again
I'm currently carving/shaping the greatstuff foam in my 29gal tank so that it will make two separate waterfalls. I want to test the water, but I don't think that I should test the water until after I put the siliconeII on the GS... is this correct? There are a lot of tiny holes in the GS... and I think I've read somewhere that you want to keep the GS sealed away from the water or ... ??? bad for fish? anyways...

So should I wait until after I silicone the GS before I test the waterflow?
I'm thinking yes, but want to make sure

Thank you for anyone who answers this noob question! ^^

[froggsong]

yup, wait to test it, then wait until you can't smell the silicone AT ALL before you run water through it. You can mist it a bit to speed curing though.

[DazzleDiscus]

ok thankyou.