Plants Not Thriving
Hello Planted...
You might try what I do. Plants are living things and I don't know about you, but I wouldn't want to eat the same thing all the time and neither do aquatic plants. When I notice growth slowing, I change the fert.
I prefer organic, hydroponics liquids, because they're easy to dose when I do my weekly 50 percent water changes. Anyway, every few months, if there's slow growth, I change the ferts I use. Fortunately, the company I get the ferts from has several kinds. This way, the plants get a variety of nutrients and stay healthy.
May sound strange, but it works for me.
B