Quote Originally Posted by rfeiller
it is the nitrates that the plants want and the trout don't. trout are raised in close system quite frequently. to build up the nitrates to the levels necessary you would have to have a very slow dilution system. not open flow.
Fish generally aren't bothered by nitrate levels. However, the ammonia and nitrite can kill the fish. These products convert to nitrate eventually, but until they do they are toxic to the fish at high concentrations.