I started this tank using the water from a pre cycled 12 gal tank, filter and gravel. the second set of numbers is from right after a 45% water change which seems real high after changing out that much water, 15 out of 30 gal. I'm still going to contact them to see if there is something wrong with the water system just in case. I haven't tested for ammonia, I get paid this week so I'll get that kit then.