I notice they're kind of light green looking, so I wondered if you were not giving enough nitrogen. In looking over your info, you write that you're using Flores, which is actually designed for the flowering stage. Your plants are in the growing, or veg, stage. There probably isn't enough nitrogen to feed a plant in veg using flores, so even though it will cost you some more, you should switch to the Canna Aqua Veg fert and when you go 12/12 lighting, switch back to flores. Also, indoor temps should be under 80F. If you can get it down just below 75F, you'll probably see better growth too. The fert however, is the primary problem. One more thing - always research your ferts, make sure they have all the elements that plants need to grow indoors, without the use of bacteria and fungi if your growing in hydro. Canna is a respected fert and should be okay, but if you make a change and it still looks like you're having a deficiency problem, you'll probably have to flush and get a new fert. I usually recommend Dynagro because I'm familiar with it and it's an easy one-part fert with pretty much everything plants need.