They actually take nitrogen from their lower leaves and use it for new growth. Leave the lights ON, but put them a bit further away.
You can water with tap water, but with rapidrooters you know you are not supposed to water them at all? The way they are sold in the packets is EXACTLY the moisture you would like to maintain. Too wet, and the root zone can get no oxygen, and clones will fail. If they start appearing paler, or FEEL dry, you can give each one just a FEW DROPS of tap water to re-hydrate.
stinkyattic Reviewed by stinkyattic on . How long do your clones take to root? Just wanted to see how long it usually takes your clones to root and what do you use(rockwool,root plugs). What is the best root hormone in your opinion. Rating: 5