For the first time, the ammonia in the 10G tank tested 0!!!! 
I didn't change the water yesterday, so I only tested several hours after today's 3G water change.
Tonight's results
pH: 7.5
Ammonia: 0
Nitrite: 0
Nitrate: didn't test.
I found it a little odd that both the ammonia and the nitrite tested 0. I figured it was on account of the water change. The nitrite levels may have been very low prior to their being diluted with the new water.
I didn't change the water yesterday, so I only tested several hours after today's 3G water change.
Tonight's results
pH: 7.5
Ammonia: 0
Nitrite: 0
Nitrate: didn't test.
I found it a little odd that both the ammonia and the nitrite tested 0. I figured it was on account of the water change. The nitrite levels may have been very low prior to their being diluted with the new water.
