Well I have been talking about it for months and finally I am doing it. Tomorrow I will change out my crushed shells for livesand. I bought the Nature's Ocean from this site and some new decorations for the tank. So it will be like starting over. Any last minute advice or comments? I plan on removing almost all the water and of course the old substrate, meanwhile I will have the fish in a 30gal bucket, and will refill tank with 42 gals of the old water and 30 new water.