Delicate Sounds' Blue Berry

Another week, fairly smooth sailing so far. The one top right is way bigger than the other three; I had to scrog her. Never done this before so fingers crossed. They're showing the first signs of bloom, I expect them to be blooming within a few days from now. EC still 1.3 By the way, still getting this brown sediment in my tank. pH- bloom makes it worse. I really don't know what I'm doing wrong here as I clean the tank and equipment thoroughly every time I make a new solution. I mailed Canna about it but they weren't sure because of all the variables involved. Also, some Canna-products don't go well with H2O. I'm seriously thinking about switching to Mills nutrients next grow