Hey Max I hope you read this thread. Everything in my tank is doing great. It has only been active about 2 months. It is a 46 gal. bow front. You have me worried about the crushed coral. I have the fine crushed coral in it and I want to change it to sand after reading what you said about crushed coral. But how? I am thinking about taking a little out every day until it is almost gone then start adding sand. What is your opnion? How should I change from crushed coral to sand?