Normal for fry to stay at the top?

[GhostFeather]

Just how does the airstone siphon for water changes get the debris off the bottom of the tank?

[Hallyx]

I'd like to know that, too. But, more fundamental, what is an airstone siphon, and how does it work?

[youlovegnats]

It doesn't. It only works as a sponge filter. You'd have to siphon out by a gravel vac or manually sucking on the end. >< Lemme tell you, fish water in your mouth isn't tasty. xD