This  is turning into  a bigger problem than i origtinally thought  

I looks as if  I've got a parasite problem ( 1st time)  .  There  has been some  small white spots apperaring on the  glass over  the past  couple days  and now  a  dustlike covering over the fish ( which are  acting  strange still btw)
Upon looking  clser at these white  specs on the glass, they appear to be   small  parasites with  approx  6 legs  apriece.
Can anyone reccomend a  decent  parsite tratment for   a reef tank ?   I  dont think I can  just  remove the fish   and treat them as it appears to be nthe glass as well ? 
I guess I know  tyhe source fo  my fiosh's  strange behaviour,    now  I need to know what to do  to help them