Reminds of funny and scary story, I have a 210 fowlr with 200 lbs of rock. I was so not happy with my 'scape, it was a wall of rocks. I had been siphoning the sand out and the whole front in front of the rocks was bare bottom. But I was way to lazy totackle the re-scape; I was slighly adjusting a rock and the whole 200 lbs of rocks came sliding down, wholy cow. No crushed fish and made me do the re-scaping. I am so much happier now, really opened up my tank, glad I did it. So the moral of the story, If you are asking this question....rescape you'll love it.