Sand bed thoughts

[EmilyB]

Some discussion on this during the Victoria tank tour....just thought I might start a thread here for some of the people who've kept a sandbed for a longer period.

I'm removing the bed from the 120g, but I have been wondering about the whole thing since I switched from a shallow cc bed a few years ago.
I had a LOT more life, but I did have probably 2lbs live rock per gallon.

Originally, I was going to replenish some sand in the 155g (four year old sand bed)...now I don't think so.

Thoughts?