Well its been running several weeks so I think the toxins would have killed off the fish by now. Next planting time Im going with hydroton 100%. Have it bought and sitting by the grow bed already lol. Going to pet store today and getting a few more goldfish. Hopefully between that and the blood meal I see a little more green in the plants. I seen they have aquatic plant fertilizer there also that seems to be mostly iron. Says fish safe so maybe I can use that for the iron.