Yea i had a battery air stone going the whole time, and also had a comforter over the tank to stop the heat loss but no luck... the silver were both gone in the morning.. the jar and all the Cichla were all fine and i was SUPER glad about the Cichla hanging in there for me.. I was surprized that with the comforter on the tank the heat never dropped below 68 even after 11 hours..