I have a 45 gallon tank with 5 fish in it, the tank has had ICK in it basically since its been set up i don't have the money to set up a QT tank so i have just been maintaining it with proper nutrition and weekly water changes, and for the most part all my fish remain ich free no flashing and never any white spots on them. recently my neon dotty back has gotten it really bad and wont stop flashing but all my other fish are still really healthy fighting it off accept today i noticed my wrasse flashing a lot. is having the dotty back in my tank with the bad case of ick making my other fish more susceptible to it? or does it make no diff if ick is in the tank thats it it doesn't matter if one fish has it worst then the other?