That really gums my bubbles

NOTE: I took the pics on Saturday to match up with week 3's ending, I just didn't get around to posting until now. I added an extra gallon of properly-pH'd distilled water to the reservoiur to thin it out a tiny bit as they were getting too many nutrients, but otherwise I'm still going on the same 2 gallons I put in originally + the one I added! No nutrients for the two smaller ones in the cups, watered them twice during the week with distilled water, that's why the bottom leaves are turning yellow I think. I'm not too worried about it, I'm trying to keep them small for the moment anyway and they're otherwise healthy! Otherwise all good and my wife is healing :)