My tank has been set up for roughly 3 months. I let my tank cycle starting with two fruity tetras, all levels were normal. I then added 3 more fish about 3 weeks later. Again, levels normal. About a month ago, I added a few live plants, no difference in levels. Yesterday, I decided I wanted to add some more fish. So i checked my levels. Ammonia 0, Nitrite .5, Nitrate 1.0, PH 7.6 (my ph has been 7.4-7.6 since it started) . So I added some more fish yesterday evening. I just checked my levels and now Ammonia is 0, Nitrite is 2.0, Nitrate is 5.0!!, and the PH jumped to 8.4! This fish are acting just fine, but I can't believe the Nitrate is so high.
The reason I am troubled is I have never seen this kind of jump in my numbers after adding new fish. However I have never had an aquarium with live plants in it.
Any help would be appreciated.
My last water change was March 28th, 10%.
I feed once a day, not more than they eat in 3 minutes
The tank is away from any windows, the only lighting the tank has is one 5500k daylight (18 watt) bulb. (I'm not worried about this, as the plants are flourishing and growing like crazy!)
I have a Marineland Wet-Dry Multi Filter Millennium 2000 (filter cartridge last changed on March 15th).
Temperature is always 75 degrees F.