ray john
New Member
please can someone tell me what to do . change water as like every sunday about 30% . and hoovered it a 5ft tank set up since oct 05 did a test about 3 hours later 1st time did test after water change. normally do test in middle of week once month. all test have been ok unit this time p.h=8.5 ammonia =0.0, nitrite=0.1 all same as usual unit i got to nitrate = 50-75 mg/l what can this been ? do i need to change more water tonight and every night this week ? to get it lower . but what causes it ?