I siliconed some eggcrate to the back walls of my corner tank...how long should i let it dry before applying the foam? Also, I am unclear as to when the sand and crushed coral should be applied to the foam....does the crushed coral and sand need to be rinsed first? If so, can it be applied while still wet? What is the time frame for allowing it all to set before water is added? I know it is a lot of questions, but I don't want to make unnecessary mistakes. Thanks for your help!