Its weighted but I still had to put a few rocks on top. I really like it and so do the fish and snails
Works as advertised. Bubbles a little big for my liking but that is no fault of the co op.
I kept hearing the hype of these airstones and I said I will just order one and loan behold I understand why. I will be buying more for a future fish room and keep more on hand.
I bought 2 and tested them out. I had to fanagle a little the tightness of each threaded piece to get them to bubble at their best and the quailty of the threads and fit of the pieces is dissappointing for the price since these are around $1 a piece at other sites. But they perform as described so no dissappointment there and I would never had known they existed if not for the co op.
Sinks..Check, bubbles like a beast..check. However, and perhaps I was doing something wrong, I found this to be too loud and distracting. I only used it for two days. As far as I could tell it was a great quality product and worth the money for the bubbling/sinking power, but my tank is in my bedroom. So, I would recommend it if you aren’t a noise snob like me.