I'm not sure if you are doing this but sometimes back to back water changes are needed in cases of high ammonia. IE. finishing a water change then immediately doing another.
What kind of test are you using? Sometimes strips can be inaccurate, a good drop test is the way to go
While you are getting through this ammonia process I would cut way back on feeding to help produce a little less waste. Also it would be helpful to purchase a second filter to help with the over stocking. Once you do enough water changes to get the ammonia to less that .25, continue doing water changes daily until you cycling catches up a bit. Hopefully this helps
What kind of test are you using? Sometimes strips can be inaccurate, a good drop test is the way to go
While you are getting through this ammonia process I would cut way back on feeding to help produce a little less waste. Also it would be helpful to purchase a second filter to help with the over stocking. Once you do enough water changes to get the ammonia to less that .25, continue doing water changes daily until you cycling catches up a bit. Hopefully this helps