Hello I have a 190 gallon reef tank fully stocked. 25 fishes. I bought a powder blue tang from divers den and did not quarantine it. So now my purple tang .powder blue .kole tang .fox face .royal gramma and red velvet wrasse have ich. I have a 40g quarantine tank set up now with a chevron tang and 6 anthias being QT. i know the ideal situation would be to take out all fish. Get a qt big enough for them all and treat in qt tank will display stays fallow for 10-14 weeks. But as of now I sort of do not have the space or oppertunity to get a 75g qt tang. This ich has been going on for about 4 weeks. All fish do eat. Sometimes powder blue is not interest in seaweed but he will eat it. What would you guys suggestions be for me to do now? Tnx a lot for help