1st Timer

Going into the 3rd week and noticing a bit of curling under on the older fan leaves and they feel dry. I'm thinking that I over-watered.. On top of that because of last weeks dry tips I backed the lights off and only had them at 40% at that time. I never turned them higher so then they stretched and some fell over... So a few days ago I turned the lights up to 80% but still was watering... Yesterday I turned my lights up to 100% and haven't watered for 24 hours and will wait at least another 24 hours. My ph looks like it's at 6.8, which may be a tad high? Any tip are GREATLY appreciated. Yah bless.