Cichlids ?

Hi all. I’ve had a fish tank for about five years with mixed peacocks/mbuna without issues. I got a few new fish last week and I’ve had some disease or white spot occur.

I’ve done a Aquaone Broad Spectrum treatment yesterday and dialled up the heat to about 29. The fish seem worse today and they have rub marks on their body and my favourite one has eye injuries.

I’m wondering is there any point in adding another broad spectrum treatment? Can overdose. I’m also thinking the temp has stressed the fish.