And one more thing: According to at least one reliable source, some plants like hornwort can directly metabolise ammonia. In addition, live plants help control algae.
I have 2 t5 HO lights and a regular tube light on a 37gal high tank. My java fern like it should grows fairly well attached to the tree branch I have but I also have Sagittaria and it just doesn't grow. I'm really not sure what to do. Any thoughts?