I'm a first time grower and have some 2 week old seedlings that the bottom set of leaves are yellowing slightly. They are approx. 3 inches tall and have 3 sets of leaves. They are in 16 oz plastic cups with holes punched in the bottom and each are under a 2200 lumen flourescents 18/6 with a fan blowing. The soil is Jiffy-mix which is 80% peat moss, 20% perlite and less than 1% lime. I water every 3 days with distilled water. I tested the N,P,K and PH of the soil with results of: PH=7.0, N= Low, P=very low, K=very low. Should I begin adding Terracycle plant food 3-2-2 and half strength Superthrive once a week? How do I lower the PH and how low should I lower it?

Thanks.
Mattheww31 Reviewed by Mattheww31 on . Bottom set of leaves yellowing on seedlings I'm a first time grower and have some 2 week old seedlings that the bottom set of leaves are yellowing slightly. They are approx. 3 inches tall and have 3 sets of leaves. They are in 16 oz plastic cups with holes punched in the bottom and each are under a 2200 lumen flourescents 18/6 with a fan blowing. The soil is Jiffy-mix which is 80% peat moss, 20% perlite and less than 1% lime. I water every 3 days with distilled water. I tested the N,P,K and PH of the soil with results of: PH=7.0, Rating: 5