Originally Posted by Jon88
Cycle has changed there formula from what it use to be. No live plants and the nitrate is still zero tested again.
Other fish in tank:
2 Bala Sharks
1 Pink Convict
1 Bristlenose pleco
1 Clown loach
2 Neon tetras
3 Zebra Danios
All other fish are fine, eating and swimming well.
This is just to strange. First, i'm very curious about your test kit for Nitrate. If you understand the nitrogen cycle, you understand that ammonia is broken down into nitrite and nitrite into nitrate. Nitrate accumulates and is reduced by water changes. (100ppm Nitrate becomes 90ppm after a 10% water change, assuming the source water has 0% nitrate) You see why it is not possible for Nitrate to be zero.
Are you using a Nitra Zorb packet or some other chemical resin? If not, then zero nitrates, as mentioned by jeaninel, is a sign that the ammonia or nitrite is not being processed. Yet the fish are alive. Something is not adding up here.
Also, why on earth did you pick this crazy mix of fish? They simply do not go together. Give it a very short time and you will have fish eaten or serious aggression leading to disease.