White Widow First Hydro Grow

From my last post (a little late on 23/03) the ladies have grown really well and filled out... another 2 sessions of LST and some minor topping down on the odd shoot. They are starting to spread out nicely. To try resolve the "rust-like" spot issues I found on 1 or 2 leaves of each plant, I added a minor dose of Seachem Iron 1m/ 20L to see if it was perhaps an iron deficiency causing the spot issues (27/03), will monitor over the next few days if any more crop up. The nutrients in the hydros are still the same as last week when I added in a fresh batch of grow nutrients (21/03). The ladies are definitely drinking more now that they're bigger, so will probably have to give them a fresh res change with fresh nutes sometime this coming week coming 27/03/22