Hi dude, Take a reading of your Res. Temps they should be between 15oC and 20oc no higher, no lower, Any-lower and optimum growth levels will slow, and any higher and mould will become an issue.
If your reading is between 15oC and 20oC then you are on track but if you are outside of those parameter's there are things you can do ie, small water heater's meant for tiny fish-tanks and you can also get water coolers but this will be more expensive. I doubt you'll need coolers as your using LED's but post the Temp. readings in each cab that would help..
The chances are its not the temp of your Res. or room thats slowing the plants but my answer is 99% pointing at 'root-damage' the plant will stress over this and could do 1 of a few things ie: Hermie, Die, slow to a near stand still, but if it does pull through it may just be stunted..So expect the yeild to be effected. Make sure you stabilize the PH, cut off any dead leaves, and if its just the tips of leaves are burn't/dead/dying cut them off flat at the ends and take away the problem area.. this will also effect growth rate, but providing you treat them with upmost respect and care for food and PH levels then you should be able to get them to recover and still do fairly well upon harvest.. I hope thats helpful to ya..
Ps/ the pics look good

on your next update, if you could take a few shots with the lights on and a few shots with the lights off (so I/we can see the colour of the leaves etc etc)
By topping them late really increases the size of the plant doesn't it

you'll really start to notice the benefit of this once the bud production excellerates
Could you post a pic of the lower stems..thickness and the rockwool cube (lights off), do you you have any salt build up? speak soon - STELTHY
