OMG, that looks disgusting!

But' I'd like to just back up that last guys post. Having some sorta habitat for the beneficials to live in is a great idea. Lava rocks in a sock or organic material in a bag, is a perfect plan. Pretty sure they will be attracted to your airstone again as well, since it is their main source of oxygen, but airstones are cheap and easy to clean.

:To prime an airstone. Detach Airstone+Tube From PUMP. Place stone in clean glass of water. Like a straw, suck water into the tube(not in your mouth), and blow it back into the cup. Repeat, until bubbles come out where they didn't used to come out.
Usually this is done when an airstone is used for the first time, or has been allowed to dry out.: