Good luck on your 3rd reseal! I prefer to reseal any tanks with an adhesive sealant as Clay suggested. It was worth the slight extra expense for me.
I don't think you really need the pink foam under your glass tank. The tank looks like a Perfecto or All Glass and really should be supported by the perimeter of the stand. Judging by the pictures, it appears the tank overhangs the stand on the sides. Any chance of a closeup?
I would definitely wait at least a week before filling the tank to let the silicone cure properly. Again, that is just my preference.