于 2002-09-29 12:19 Hi all, I just set up a Q-tank 3 weeks ago, and i don't know why the level of NO2 is still keeping in a very high level until now. My tank had 3 damels before they all died. And then i bought one tomato and it seems living quite good. I have dropped the whole bottle of N-bacteria into my tank since last week. Can anyone tell me that why the NO2 is still so high?? And how to reduce it?