I'm interested to see the tank with no sand.So I just removed the majority of my sandbed. What a relief! The sandbed was driving me insane, 50% of it turned into concrete. I pulled out a hunk that was about 20" x 9"!
What's really cool is that on one side of the tank where I siphoned out the sand, a huge plate of solidified sand created a really cool over-hang/clif. Pics soon once I finish cleaning it up.