Root development begins! No nutrients in the tank water itself. Just feed from the top with an organic solution. Fish tank has 4 American Chiclids, 2 Pictus catfish, 2 algae eaters, 2 red tail sharks and a corydora. Their food contains no fish meal, all mealworm flakes, brine shrimp and whole ingredients. Whatever they eat trickles down to my plant. Cannabis is an accumulater plant, absorbing toxic heavy metals so cant be too careful!