I have a 20 gal. Tank with 10 juvenile corys and 3 otos. Almost 2 months ago I rehomed 6 tetras to make Room for the baby corys. At that point my tank was cycled and running for approximately 5 months. During that process, I stirred up a lot of gravel and have had ammonia ever since. Ammonia is usually at .25ppm but can go up to .5 if I don't do a water change at least every other day with prime. So basically, I'm completely frustrated with this tank. I have been doing 50% water changes daily or every other day but it's been like 55 days and I can't continue to do water changes like a maniac. I use prime as a water conditioner to detoxify the Ammonia. The tank has a fluVal 50 gal filter with 2 air stones. PH is 7.4 which wouldn't cause the bb to die, but that's exactly what it seems like happened. It's almost like something is preventing the bb from being able to grow and process the ammonia. I thought maybe it was lack of oxygen so I added a bigger air pump.. If anybody has any solutions, you'd be my hero. Please help me return to loving this hobby like I once did... I should add that I've cycled a tank twice before and I realize it takes time, but I don't even have nitrites or nitrates. I don't have any ammonia in my tap water either.