This is where things get tricky 'cause people start swearing.. about their techniques...
some swear on deep undisturbed sand beds, supposedly ya don't wanna disturb the anaerobic bacteria and stir up organics trapped in there....
some believe in siphoning just the top layer of the sand bed... some on siphoning and cleaning the entire layer of the sand bed...
I do bare bottom tank w/ a deep sand bed in the refugium and NEVER touch it.... but that fish store I met up w/ you at (FC) always deep siphons their sand bed regularly.... both works in its own ways....
get a diamond goby, it'll eat up all that sand surface stuff and churn the sand up before any algae will establish itself
Lol, this always causes a debate.
I vacuum my sand every week, during water change. I also blow the parts I cant reach, with my baster. I figure if you vacuum from day 1, and keep up on it, it's fine. If you've never vacuumed before, either leave it be, or vacuum little by little, each water change. Personally, I hate the look of green and purple sludge along the glass, in the sandbed.