the product cycle doesnt work..so you need to have a proper cycle with fish because the bacteria are not sustaining in cycle like you need....its something you will have to use for the life of the tank and the day you dont, it stops the entire cycle process..id stop using cycle, get some prime water conditioner, get an
API liquid master
test kit, and do daily 50% water changes until your cycle is complete with
ammonia and nitrites at 0 and 5-20 nitrates...I agree shaina that you are way overstocked and things arent going to look up until you rehome some of these fishies or do daily changes for a long time...goodluck!