I have seen this in a couple post but nothing I could reply on. We are having trouble with ammonia in our 37gallon tank. We've been doing partial water changes (30%-50%) every 2 or 3 days. It seems to be holding at 1ppm will occasionally drop to .5ppm but will usually jump back to 1ppm. We've been dosing API ammo lock and even tried fluval ammonia removal (bag). What can/should we do? The fish in the tank seem to be doing fine, however we added a few fish and they died before we started treating for ammonia. All other levels are checking good nitrates, pH, etc. Thanks in advance.