
Originally Posted by
LilyPad
Can you post some pictures of the enclosures? You do not need water in the base of the tank, just a water dish would be sufficient. Was the water filtered? Were you changing it at all? How were you feeding them when the tank bottom was filled with water? Whatever water you use with your animals needs to be treated. Chloramines will not gas off. Do you have some pictures of your set ups? Were you using any supplements? Was the topsoil free of fertilizers and pesticides? Sphagnum can cause impaction with frogs that eat as aggressively as grays. Mixing subadults and adults can be okay (more likely they were males and females, can be quite a size difference) so long as none are less than half the size of the biggest. They like ventilation but not necessarily "dry" air. Were they burying themselves at any point? Food should be no longer than the space between their eyes. Can you be certain the worms and insects that you dug up were pesticide and fertilizer free?
Did you disinfect the tank and decorations at all after the first ones died? If you did, how did you do it? Gray tree frogs sold in the US are pretty much always wild caught and could have introduced some pathogen into the tanks.
Obviously, there are some big issues going on somewhere for them to die so quickly, I wouldn't get anymore until we can figure it out.