The 12/12 Girls look Fantastic! The clones were looking great 2, but they look Overwatered now. They are pretty small in relation to everything else, and dont need to be fed everytime you feed the Big Girls. Let the cups get light / dry out before you feed them again. The spotted leaf looks like a ph issue, re-calibrate your ph meter.
Opinions are like A$$holes, everyone has one and they all stink! Hehehe Just kidding, but here is my take on my Hempy experiences. General Hydroponics is a very gentle Nute Formula, and I would feed full strength all the way through. I would also get deficiencies when trying anything less. I believe doing Nute, water / Nute, water, water or anything like that is more for soil. Also, with Hempy, it is possible to get pockets of salt build-up, it is usually not uniform, you may notice 1 area of the plant showing something totally different from the rest of the plant. In Hempy you can get away with a QUICK Flush. You can use plain ph'ed water and/or Flora Kleen (or something similar). Put the plant and container in a tote filled with enough flushing agent to totally cover the Perlite, and let it sit for about 10 minutes, then lift it up so the water runs out the overflow, continue pouring water from the tote through the top to rinse out through the hole. Several times should be just fine. Then tilt the pot to release as much of the flushing agent as you can. Re-apply full strength nutes allowing a little more run-off than normal. Then just continue as normal.
I dont recall if you have Flora Kleen or another Flushing agent? As you know, I spend alot of time Rain Manning through everything on the Forums, and not just RollItUp. Paying attn to all the different ways everyone swears is the only way (Hehehe, sure?). Flushing Soil is Very different from Hydro/Hempy. Last couple Harvests, I Flushed with Flora Kleen (+Molasses) for 2 days, and ph'ed h2o ( + Molasses) for 2 to 3 days, then chopped. It was a huge difference! As soon as it dried, I rolled a fattie for Quality Control (hehe), and it smoked as if it had allready been curing for a month. I do not believe Hydro/Hempy need more than 5 days flush at the end because the medium is inert.
Oh, and the green algae wont hurt your grow if just on the top layer of perlite, but you might as well cover it with something DIY. Without light, it cant live.