Same ol' same ol'... ammonia at 0, nitrite at .3. I picked up some airline tubing at the store today and tossed in an airstone that came with the tank (hooked up to an air pump, of course) to see if that'll help. I've hesitated to use it because I've been afraid if I cycle using one and then stop using it, the bacteria might die back. But then I'm wondering if such a tall tank might need an airstone for better water movement since it has such a small surface area relative to height. Any thoughts? Also, this is one of the small airstones currently (maybe an inch or so long?), but it sure has the surface moving a lot. If I leave an airstone in long-term I'll pick up a longer one to distribute things more evenly, but will that much surface movement upset the hatchetfish?
)) and as long as they have at least somewhere in the tank to get a rest, things should be fine with faster moving streams. One of the issues with bubbles is just usually the noise of the pump and/or some minor surface noise from the bubbles. Some just don't want this.