As you can see on the pictures of week 4 the lower leaves seem to die. I don´t know whats wrong. She gets not too much nutrients, is sitting in BioBizz Light Mix, gets Water with PH 6.5.
PH water 6.5, PH soil 6.3, PH drain 4.5.
Hi there ! Your answer is in your question as you told us your drain ec is 4.5 ! You are experimenting a Ph fluctuation , and to fix it you'll have to flush your plant with the proper Ph to reach 5.8. Every things else is fine