I have a 55 gal. that has only been occupied about 2 weeks and noticing a few of my cichlids and algae eater have ick. My BGK is also in here with it. How can I do treatment without killin my BGK? I have some Wardleys essentials Ick away. It says nothing about knife fish, but does say for sensitive species to use half doses. Should I do this, or try another med? Thanks in advance