PH of 7 is to high. you do not want to go over 6.5 if at all possible and not lower than 5.5. My favorates were 5.8 in veg and 6.2 in flower. Algae can be one of the worst things you want with Hydro. Zero light to the water and zero light to roots. As for the "settleing" you asked about, if you are talking the sides above the waterline than yes that is normal. A 1" air stone is a little small, if possible run 2 per bucket. That fan leaf looks like a normal deal of the big fat leaves not getting as much light as they want and go bye bye. No big deal as I also saw a couple other leaves in pic that are doing the same thing. Nitrogen gets cut down during flower and can support the plant but not those huge light sucking leaves

Btw not sure what form was needed for but good job filling it out.