Healthy or not

First off, I can't post a picture right now so lets get that out of the way real fast.;) I was using the House and Garden line of nutrients but I found it to be very inconsistent with pH and a few other problems. I switched to the Advanced Nutrients pH perfect line G,M,B 2 nights ago. (DWC with reservoir---RO water and a super high output LED -cant remember the wattage) My question is this, how long will it take the plant to rebound from its ailment, and should the new growth I'm seeing be lighter green than the rest? I theorize its the lack of pigment from low amounts of chlorophyll because its so new? Also, at what point do you think I should implement CO2 into the sealed room? The plants are at about 3-4 nodes now. My room is kept stays anywhere from 62-68 degrees right now. Is this ok? I'm sorry this is such a ramble, I'm a hurry to get this out because I have class. ;) Also my pH is at 5.8-5.9.
 
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