Thanks everyone.
Joey, I used Hydrolic Water Stop. I will have to look at the bag tonight for the brand. I did a lot of research and decided to go this route because of the fast cure and short cure process. With this product you have no PH spike. First I tried putting spray foam on egg crate and then covering it with the cement mixture. It was easier to get the shpaes I wanted but didn't cover the foam well so I tossed it. This is just cement and oyster shell over egg crate. It makes a very realistic texture. I could have spent more time and created better shapes but wanted to get the tank going. The down side is a very short work time. Maybe 5 min or so per batch.
Joey, I used Hydrolic Water Stop. I will have to look at the bag tonight for the brand. I did a lot of research and decided to go this route because of the fast cure and short cure process. With this product you have no PH spike. First I tried putting spray foam on egg crate and then covering it with the cement mixture. It was easier to get the shpaes I wanted but didn't cover the foam well so I tossed it. This is just cement and oyster shell over egg crate. It makes a very realistic texture. I could have spent more time and created better shapes but wanted to get the tank going. The down side is a very short work time. Maybe 5 min or so per batch.