For the price, I think it is a worthwhile investment to make your own. I got the kit from
https://poseidonreefsystems.com/products/phytotank-complete-kit
I've had pretty good success making my own and dosing it to my DT using a third tank from them with the dosing attachment.
https://poseidonreefsystems.com/products/phytotank-complete-kit
I've had pretty good success making my own and dosing it to my DT using a third tank from them with the dosing attachment.