Limewood Mini Airstone 8524 for Biocube Protein Skimmer, 2 Pack

As expected, super fine bubble production (saltwater). Quality limewood air stone (roughly 1" square and 2" long) 2 pack both where slightly different in size but caused no performance issues. A VERY sharp or FRESH razor blade makes fine clean work of any cutting to size or shaving down one may need to fit. "Not recommended to cut in half or down much as center is hollow"

These are perfect for mini protein skimmers on micro reef tanks. They have excellent diffusion. The air does have to be controlled by a valve, otherwise the skimmer cup will fill with water and not waste.

I use these as air stones for shrimp tanks. They are almost always up on them feasting away.

Exactly what I needed and when I bought them here on Amazon I saved quite a bit on the price it would have cost buying them at our local aquarium store!

I was able to find these at a great deal for my biocube, These blocks helped keep my tank clean over and over again for the past year and it has done a great job!

Good product

Good stuff

Great stone for my bio tube skimmer