I brought 8 pcs of parrot fish more than a month ago. Since last last week, I noticed that they are losing appetite. Slowly one by one they are dying, now only left 3.

This is my first time with parrot fish, I am at lost, but I still do not want to give up. Since there is not much info on the weds on the topic of caring of parrot fish, can someone here guide me?

Tq