Supernatural Grow Aqua & Bloom Aqua.
It's made just for hydro, It's Ph buffered so you won't have huge swings in Ph, It already has Cal & Mag, It's cheep a little goes along way, It's in powder form so it stores longer, I run my veg without a water chiller and have had no problems with my roots (I wash & wipe clean my totes between rez changes) in 76+*F h2o temps. I would suggest using chem nutes if you cant keep your rez temps at >70*F.
Supernatural came in second in a side by side nute challenge testing yield using all major brands.
Happy growing
UCDWC~