Eish... I tried my best to prevent this , but you guys are pushing me into a corner here...
The good news is that the Mandrins started to wean off...
but...
The bad news is that in July we had an 8 hour power failure, which started at about 22h00 - and I was asleep...
Needless to say, in the middle of winter, the water temp dropped to 9degrees and the mandarin's didn't survive...
I was so heartbroken I took down the tanks, and just has not gotten around to it again... It is a lot of work, and was just starting to pay off, then they died, and I could not do anything about it...
Sorry to disappoint you guys, but I still have the tanks, and I still have the receipe that seemed to work, so soon I will try again - promise.
PS: One should really invest in backup power, not just a generator, but automated backup energy - it just helps alot more in winter time. Had this happen in summer at least the temp would have been fine...