Excacly, that's the problem with the tank.
It never went through a perfect cycling fase.
It's trying now but has a hard time.
In a perfect reef world, start the cycling process and test almost everyday on ammonia and nitrite to see how your cycling performs.
When you reach that perfect 0.0 # on ammonia and nitrite you ghost feed some ammonia and watch closly how that does in 24hrs.
Some cycles can take up to two weeks or longer before you really add any fish in there.
No problem, it's all common sense.
Read up as much as possible and see if you can get that tank back on track.
You always can keep asking for help on here and we are here to help.