My tank is semi-bare bottomed. There is just a bit of sand on one end. I have several wrasses in there that like to sleep in the sand, that's why it is there. There isn't really enough for them to bury themselves, but they still lay in it at night. They don't seem to mind. I also have a Fighting Conch that doesn't seem to care about the sand, he goes all around the tank. Where there is no sand coralline has grown. I don't know why anyone would want to scrape the coralline off the bottom as I find the look of bare glass to be unsightly. Coralline in my tank is never bright pink, it is always pastel pink, so it really doesn't look much different than sand, plus when there is coralline the critters like shrimp and crabs can get grip and move about. I'm all for bare bottomed tanks - especially in SPS tanks. For LPS tanks, I prefer sand.
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~ Mindy
SPS fanatic.
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