Honestly, in your shoes I'd try feeding rather than fertilizing. Less risk that plants will go completely crazy.

But if you really want to fertilize, please have water checked for pH, alkalinity, and hardness first. If you have acidic pond with low alkalinity and hardness, fertilizing is futile. Lime it & get it in order, then consider fertilization.


7ac 2015 CNBG RES FHM 2016 TP FLMB 2017 NLMB GSH L 2018 TP & 70 HSB PK 2019 TP RBT 2020 TFS TP 25 HSB 250 F1,L,RBT -206 2021 TFS TP GSH L,-312 2022 GSH TP CR TFS RBT -234, 2023 BG TP TFS NLMB, -160