bare bottom?

[Whatigot]

IMO, the only thing bare bottoms are good for is spanking

I ran a heavily stocked aquapod with no skim for a year and I contribute my success to the 5' of crushed coral I had on the bottom.
Pod city and excellent bio filtration...
In a larger tank, I don't think it makes as big of a difference, but in a smaller one, makes a big dif.