BB Or sand Bed?

[banditpowdercoat]

Once upon a time, I had sand in my 150g. But had a Wrassehole who loved to spread sand all over my tank. So I removed the sand. Only a lil, maybe 1/4" under couple sections of rock. But the Wrasse is gone now. I'm wondering if it would be benificial to put a sandbed back? Maybe coarser? I had Fine Caribsea sand at the time.

Whats your thoughts? Pro's con's? I know needs to be within a certian thickness right, to not get the anerobic layer? Or do we want to have that layer?