It is from the Hit Musical “Fiddler on the Roof”

If I were a rich man,
Ya ha deedle deedle, bubba bubba deedle deedle dum.
All day long I’d biddy biddy bum.
If I were a wealthy man.
I wouldn’t have to work hard.
Ya ha deedle deedle, bubba bubba deedle deedle dum.
If I were a biddy biddy rich,
Yidle-diddle-didle-didle man.

Absolutely not. You need to make sure that there is no bacteial or mold growth that could destroy your tanks ecology.

You can scrub the rocks then place them in boiling water but if you really want to be safe, buy some from the store. The rocks sold there will also have a safe mineral content for the water in the tank.