Hi Bill,

With no pump I wonder if they are dying of oxygen deprivation over night when
plants use oxygen instead of producing it. An easy way to check is to get up
before sunrise and see if they are gasping at the surface of the water. I had
this happen in my frog bog when I put fish in. As soon as the sun hit the bog
the fish went back below the surface.


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