The airstone is for my freshwater tank. They were only a dollar something, so I figured I'd get one while they were so inexpensive, you know? Uh, what was your other question? Have I cycled my tank? The marine tank that I'm planning on starting? Or my freshwater? My freshwater has been doing very well for a few months now, but I haven't gotten my newest tank. I have to save some money up...I'm planning on bidding on one on E-bay, or maybe just getting one at my local dealer. :thinking: I'll have to see the price difference, it very well may be less expensive in the long run to get one at my dealer and not have to worry about shipping...costa dn the possibility of damage. Why did you ask if my tank has been cycled?