20 is not awful as a general rule, for nitrates to have an adverse effect on fish, they would have to be astronomically high! But i notice you have an anemone so hopefully someone else who knows more about anemones will chime in on that one.
Also im pretty sure you should do frequent small water changes as opposed to seldomn big ones. _________ You will never know whats in my tank as i can only type 15 words  |