BB vs DSB

Not trying to cause a big debate or anything, but I am trying to decide
whether to get rid of most of my sandbed. I recently had a slip of a
powerhead dig a hole in my DSB and after having a stable tank now I have GHA
and Cyano problems. I have talked to some people about just going bare
bottom or having just enough to protect the bottom of the tank from the LR.
My tank is 2 1/2 years old and is a 75 gal.

I need some Pros and Cons and also some how-tos if I decide to make the big
remove. Do you do it all at once or gradually?

Any thoughts appreciated.

Paulette Tawzer