I'll try to post update pics tonight, but I wanted to share this with you guys. I'm doing a background for the tank. The entire back wall will look like a muddy riverbank. I'm using foam insulation (blue stuff) and great stuff spray foam, with sanitred as the final seal on the concrete. I'll then sprinkle sand and small river stones (pea sized) here and there on the sanitred. I wanted the sanitred to be a dark brown color to look like dirt, and they don't sell that. So I called them yesterday and told them my story. They said they have tint to make it dark brown, and they'd ship it out to me. They didn't charge me for it!
Just $5.00 shipping! So I've got everything I need. I love working with the Sanitred people! Very helpful!!!!