I believe there are fish in this tank.
I would perform water changes of fifty percent any time ammonia or nitrites rose above .25.
Would feed the fish tiny, tiny amount of food once evry other day until the water test's zero for ammonia and nitrites for a week straight.
Prime works for a few hours but water changes are the only way to ensure that fishes don't suffer through ammonia and nitrites both of which damage the fish permanently.
Would add the stability and Prime with each water change as per directions.
If this tank has too many fish,some will perish and other's may survive depending on size of tank,numbers of fish,amount of food offered,and daily water changes,water changes,water changes....