Indoor Multi-strain Madness!

Busy week this week, still battling some kind of deficiency or issue causing some yellowing leaves. They grew about 4" and I didnt raise the light so I had to bring it up again as I saw yellow tips on all the top smaller growth. The older bigger leaves are still going yellow here and there but not dying or falling off, just a colour change so I'm not sure whats going on. I upped the nutrients to 700ppm and started feeding more often instead of letting them dry out to encourage root growth. Near the end of the week I believe it started to improve. The Blue Dream has no issues other than slow growth, TO #1 is only showing some yellowing but TO # 2 started to get a little worrying. I will continue to slowly increase the ppm per week from here on through flower to see how they react. I did a good defoliation at the start of the week to open them up and get some more growth tips and bud sites into the light in anticipation for flowering and they took it pretty well. I salvaged 4 lower shoots from Blue Dream and put them into solo cups to try cloning out. After 4 or 5 days under home made humidity domes and lots of spraying they still look pretty good. I'll slowly start to wean them off the domes and into a second tent I'm going to setup for vegging my next crop. I also added a small fan heater blowing into the tent during lights out as it is getting colder over here in winter and I wanted to keep the temps up above 20 degrees at all times. Hopefully these adjustments help. Yesterday (Sunday) I switched to 12/12 so onward into flower!