I have water hyacinth and its turning yellow. Not sure why and was hoping someone could point me to the problem.
They are in a 45 gallon tub that is part of my pond system of 450+ gallons of water. There is a sand and gravel filter, Turtles and gold fish. Turtles don't have accesses to the plants. The flow rate for the tub, i'd guess is about 100 gph. I did add Concentrated Extract Barley Straw to clear up the water and was wondering if that might be the issue?