Thanks gmslave. Yes, I rand H2O2 and flushed a couple times then added Hydroguard. I originally had a portable air conditioner inside the 4x4 grow tent. However the plants ran out of space, so I moved it to the room just outside the tent. I've now finally run a duct from the A/C directly into the tent and started putting bags of ice in the water. It was apparently all too little too late for that one, but hopefully not for the other two. I've actually got a couple of Gorilla Fast seeds I sprouted in a closet several weeks ago. They should have a shorter flowering time. I think I'll just remove the dead plant and replace it with those even though it's a little early. They should all finish close to the same time that way. Thanks all.