I have used these airstones in the past and I've always had good luck with them. They didn't arrive damaged or broken. I put them on a 10w air pump and I was very happy with the amount of bubbles they put out. In summer, I need high surface agitation to help cool my aquarium in a desert. These stones would easily work on a 5w air pump and if the bubbles are too much for slower fish then I highly recommend an air control valve. Overall a great product! NOTE: These airstones put out standard bubbles and not the fine mist ones.

Smaller than i expected. But it works out because i can put them in a small space, since i only have a 10 gallon tank. Going to put them in a humanoid statue and see if the bubbles can come out the eyes

These are great bubbling stones for aquariums. I soaked them for a bit then out them in my goldfish aquarium. It started a great flow of bubbles which is great for oxygenating the water. Easy to use and convenient!

I ended up using these as a replacement for the air stone in my Aerogarden that somehow dissolved. Works well, produces continuous bubbles, and was easy to slide onto the tubing. The are kind of small, about 1 inch long, but for a small tank/bubbler they should be able to provide adequate bubbles.

I have used this product before, but it is good to get a new air stone every once in a while. The two pack is great for my tank. This was the fish can get more oxygen and air flow in the tank. My fish love the bubbles!

I've had bad luck with other brands but these airstones didn't break apart just putting it in the tank thankfully! Haven’t had any problems with them. So they're sturdy enough and I haven’t seen any clogs or deadspots where it doesn't bubble.

The Imagitarium Bubbling Column Airstones are wonderful. They were very easy to attach and worked quickly to increase the oxygen in the tank, creating a better environment for our fish. I would highly recommend.

The Imagitarium Bubbling Airstone worked better than I initially thought due to the size of my tank. However, the amount of bubbles were enough to at least get the attention of some of my bigger fish, and scare the smaller ones. Didn’t leave in tank as I don’t need a replacement yet. But it’s a relief to get quality ones at a competitive price.