First grow - Tangie!

All 3 have carried on shooting up, while Isabelle has slowed down and is only growing around an inch a day her main stem buds are coming along nicely, while Suzie is somewhere in the middle of growing more mid sized sites and Chloe seems to still be putting all of her energy into growing in height and growing more budsites rather than working on the ones she has, A LITTLE bit of sugar starting to build up on Isabelle's' leaves, but will be nice to see how they all change and develop over the coming few weeks! A singular leaf that is below the main canopy on Chloe has lost some of its colour and has got odd brown spots on. I cut it off as I assumed it was from lack of light, however some quick research has shown that it could be a lack of Manganese, would this appear over the whole plant? or will it start in just singular leaves?