Actually it came from a tank up in the rocks with rocks touching both sides of it, I got it for free but it was so badly receded, stuck it on the sandbed with a little rubble raising it up and it's doing pretty good, still got some bare spots around the edges but it's eating mysis and puffy around the middle at night, still on the wrong cycle for me. I keep all my plates on the sand, just raised up a little with rocks.