Once you know the strain, you can potentially go very heavy. The kolossus I've been referring to is one I am running alongside a couple of Sugar Punch. I've grown about 15 kolossus in previous grows, and every one, whichever pheno, took heavy, in fact needed heavy, nitrogen (eg, 'Grow') right through. Once I switched this one into the 20 litre pots from the cup pots I went straight to 2ml per litre in veg. Then when I switched to flower, the first feed she got 3ml per litre 'Grow' and 'Bloom' (plus 1ml per litre of 'Alg A Mix). She's now getting 45ml (three cap fulls approx) of both in 10 litres of water at week 6 12/12 and only just showing slight tip burn - perfect imo for a 9 week strain.