Hi,
Based on my own experience, i used Seachem Prime to lock the ammonia, repeat every few days till the tank cycled. I think your was too heavily stocked.
Try to do water changes 30 - 50%, if you use ammonia test kit and measure quite high ppm. 2ppm - 4ppm maybe 50% water change.
Get beneficial bacteria. Dont use quickstart is what i advise. Maybe other brands.
This is just my humble opinion.
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