Sorry for the lack of information. This's a low budget nano tank. Am using RO Water & weekly water changes. I dont have a water testing facility right now. Everything was perfect for 3 weeks of planting, there's a good growth also. Suddenly comes these colour change. Am using Flourish Excel Alternative days.Without knowing your water parameters, PH, KH, GH, and what sort of fertilizers you use and how often, as well as the size tank and lighting you have it is impossible to give you an answer.
Your plants are starving to death.
How Can I Treat This... Pls Help