Sensi Seeds Northern Lights (1st grow)

Lights up to 75% and then up to 100% this week. Removed heat mat (I’d like to keep it for the whole grow because it regulates my lights off temp but I’m worried about damaging the roots in the long term) Topped all 4 plants this week. Plants are on about 4ltrs a week over 2 waterings. Made my first big beginner mistake, been feeding nutes with every water instead of once a week. Definitely got signs of Nitrogen overloading in the older leafs, but nothing too bad. Will stick to plain ph’d spring for a week