i moved so i took apart my 75 and took my fish out and put them in a 30 gallon just till my 75 was right with the salinity,temp.my blenny which is in the 30 gallon is rubbing himself like signs of ich.i have him and a dottyback in quarentine cause the dotty back looked like it had a white spot on his head and tail.not knowing if the dotty back was sick or not and the blenny scratching against the decos i figured he caught something from the dottyback.im not sure if the blenny is acting funny cause he is in different surroundings or if it is sick.so i put him in the quarintine tank just in case.i still have two clowns and a hawk fish in the 30 gal without sand .im wondering if i should put cuprimine in this tank before i infect the 75 gal.if they even have ich