God... I'm tempted to give up...
Since the 18 hour days thing I've had: nitrite peak, carpet surfing, fungal infection and fin rot. The smaller weaker one is REALLY in a bad way: most of the fins rotted off and possibly lost an eye (can't see him properly)
I have actually set up a surveillance camera on the tank, because I cannot believe all this happened by itself.
Now they are all under fungal medication and seem lively enough (though not happy), even the weak one, all things considered.
I am seriously considering rehoming them and getting a pair of F1 altums (guy at the LFS knows someone who breeds them). I love them dearly, but I'm getting the feeling I just cannot look after them as they'd need.
... Oh well... we'll see once this is over and I'll decide.