Wow, my saltwater memory is working hard here. It can be done easily with a bubble wand or airstone and a pump. The smaller the bubbles the better is true in any case, but especially so in SW tanks. IIRC this is because of the difference in surface tension between salt and fresh water. Using bubble stones or wands in tanks with inverts is a no-no. IIRC it has to do with the inverts getting excess gases inside them, creating internal bubbles that can be deadly. That is a big reason you don't see it done in reef tanks and such. In fish only tanks though, no problem.
So many fish, so few tanks.
"In the fields of observation chance favors only the prepared mind." - Louis Pasteur