luna 13

hi everybody,
since the last 3 weeks my nitrate level is always 0 is this okay?
i added some life plants around this time could this be the cause? Before that it used to be between 5 and 10. Thanks for any response, Nora.
38 g
7 male guppies
4 cory cats
3 black skirt tetras
4 pristell tetras

agabr123

could definitely be from the live plants, what kind of plants did you add? some act like sponges to nitrates how often do you do water changes?

luna 13

i do weekly water changes I added a anarchis a java fern and giant hair grass,wich is slowly turning brown and I do not know why.