If you didn't have any fish or inverts or anything in a tank with plants, could you dose it with Miracle Grow? I sat a tub outside to try to grow plants in. It's got top soil substrate with water that I took from the aquariums during the weekly water changes. I was thinking of dosing it with Miracle Grow just to see how quickly they would grow under those conditions. I won't be putting any creatures in the tub with the plants. Has anyone ever done this?