Corey wrote I also suspect that if they
were oxygen starved, they might be right at the surface instead of
diving deep?

Yes, they'll be gasping at the surface if they are lacking in oxygen.

I guess that behavior
might be "spooked" out of them for some time to come?

It will probably take a couple weeks for them to come around.

Hope you can discover what happened!



kathy :-)
algae primer
http://hometown.aol.com/ka30p/myhomepage/garden.html