So this week I added another 65w CFL bulb to the light box that boosts what they get through the window. As we're getting a little more sunshine and warmth they spend daytime out on my balcony in direct sunshine as well. O
I've boosted nutes to 0.5ml per litre, but I'm happy to take it nice and slowly rather than risk nutrient burn. They seem nice and dark leaved at present so I don't think they're undernourished in anyway.
They've been moved into 1 litre net pots which are fed from a single wick in each pot running down into the reservoir below.
They've all evened out in size nicely, not growing in height much but putting on good leaf mass and broadening out.