It was in the back of my mind that maybe the thermometer was off but i'ts quite cold in the room. Just to be sure, and because you mentioned it, I got a cheap glass tube type thermometer to check and sure enough its the same reading as the digi thermometer I've been using.Check your temp gauge and make sure its not off.
I had a thought about temps. I have 2 submersible pumps one in each bin circulating them as one unit. The water temps are fine, low in fact, but I bet inside the pump warms up, possibly creating an environment that could foster bad organisms. Now that I'm running h2o2 all the time it kills it as soon as its starts and the rot hasn't returned since. So I decided to expand my search and try to find a better single bin. I originally wanted just one bin but couldn't find it in my area. I did find one that is suitable, so I'm thinking of starting over. Why bother to continue with these slow growing injured plants when I could start again with a better setup and run h2o2 all the time thus probably never getting root rot in the first place?
So I will probably do that and I could take clones off these current plants. Would the fact that they had root rot effect them after cloning? I don't see that it would, it seems like that would get rid of the whole rot issue and it wouldn't be too much of a delay, the plant are small and so much time ect. has been wasted already.
Let me know what you guys think, thanks.