My nitrites reading at 5.0, tank is four Weeks. Doing 40% pwc
alternate days, ammonia perfect, all other readings perfect , including niTRATES. Have 9 cichlids in a 36g. 1-2" younger fellas. what can I do? Readings were great but had to toss older filter due to it breaking. No way to get filter media. Any way to fix this situation? Fish seem fine..