What size pots? If they were under very little light it may have slowed growth. PH is not extremely important in the clone stage, but nun the less it does play a factor. I would wait until next watering and PH at about 6.5 for a nice stable uptake of any needed nutes which it shouldn't need much of at this point if any. That is why PH is not as important right now, Ph is what helps to regulate and maintane the level and ability of the plant to uptake needed nutes. Also, I have these mesuring cups from the garden store that measure in TSP's and I would probably be giving about 12 to 15 TSP's of water a day in my set up, but I use alot of perlite and water drains quick and this would be in little 3x3 or so starter pots.
Also I am a misting fanatic. I mist my rooted clones about 4 to 5 times a day, some only do it twice, but I think I am a misting attict. Just get a spray bottel and go to town with some PH'd water and maybe add a little Liquid Karma, I use Super Thrive and Liquid Karma. If you do this, start off twice a day and see how they react. I have really low humitity in my state this time a year so they eat it up, and don't mist during flower once buds appear unless you really know what you are doing because your buds can get mold on them.

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