Tabella fertilizzanti Advance nutrients

Do as you see fit. It's going great!

I used AN from long time, but I never used piranha and tarantula. I used sometimes very little bit of Voodo Juice but I prefer Hydroguard to keep the roots safe.

I assume your talking about DWC systems or RDWC systems these are the only ones that need to have chilled water for optimum growth other hydro systems like nft and flood and drain do not require this though it certainly helps i would always go by the nutrient feed table given by the nutrients you have as they have already worked it all out for you :) best of luck buddy