keeping an air stone in place

hey folks just wondering if anyone has any suggestions as to what to use to hold air stones in place? I was gonna use fishing weights but my friend said they release too much crap into the water

I use the 6" kinda square stones. I use coat hanger wire to make a cradle for the air stone and it holds it a couple inches from the bottom. I use air hose to protect the stone from the wire. I bend the wire into a square without one side. Then make loops on the loose ends for the stone to slide into and bend the base into a half moon shape to sit on the bottom. Be sure to use the air hose to insulate the stone from the wire because the constant vibration will cause the wire to cut through the stone.

If the stones have a flat bottom and you have a hobby craft store near by...
Buy some small suction cups and silicon glue one or two onto the bottom of the stones (Hot glue gun works faster). When cured and set, sink it and press down so the suction cups stick to the bottom of your res.