I was always led to believe prime will detoxify ammonia .
and some are said to remove chlorine but …
Being a fishless cycle.
After adding a ammonia source it’s best to leave it alone without doing water changes
a good test kit would help pin point where in the nitrogen cycle you are but it’s not required .
Nitrite is useless in marine IMO but again it can identify yes you have started the second stage of the cycle .
once ammonia is zero and nitrates are elevated it’s water change time and start adding stock ( fish ) SLOWLY !!