Do a water change, and sell the waste water online as "freshwater phytoplankton" for feeding clams, daphnia, and other filter feeding organisms!
Alternatively, grab something like water hyacinth or water lettuce, and use that to suck up all the nutrients (or pothos. Pothos is great when the roots are in the water). When finished, dispose of the plant as necessary (burn it/compost it).
How deep did you plant the osmocote tabs?
So many fish/plants/inverts to keep, not enough aquaria.