Yellowing leafs 4th week blooming

The rusty spots on the leaves are, in my opinion, caused by a fungus. These kinds of problems often arise from low temperatures and/or high humidity. Such high humidity can, for example, be the result of an overcrowded grow tent or simply too much water at the roots.

Hello. I don't use your brand of nutes but have used plenty of 3 part base nutes before. You most likely need to start lowering the grow nute by now. I find a calmag supplement helps all the way until the last week of flower. I can't really see anything wrong with the plants on the diary they all look fair nice to be honest with you. Check you nute brand schedule to see if you need to alter the ratio of grow, micro, bloom. When in flower they use more phosphorus and potassium then they do nitrogen.