Some of leaves have yellow spots.I dose API leafzone on a weekly basis and flourish excel on a daily basis. I have 2 13W CFL illuminating my 10 g. Any ideas why they are getting the spots? Suggestions and advice welcome.

Hi fellows, I planted Cardamine lyrata in my new tank along with other plants, the details are below Size: 140L/37G Substrate: ADA Amazonia New + ADA substrate additives Fert: ADA Green Brighty Step1 and Brighty K Light: 0.6 watt per litre/ >2 watt per Gallon and CO2 For first two weeks the...