Al MC,you sound like you may have dealt with this before
,and learned the hard way,as myself and so many others have.
erifish,ich got into your system,it sucks.It is now there and ALWAYS will be,unless you empty your tank of all fish,treat them with hypo or copper,or let your DT fallow for 6 weeks or more.Your inverts can stay,they can carry ich but ich can't host inverts,without a host it will die off. I did this about a year ago,it works ..... Also,just noticed your stock and tank size,theres alot of stress going on in there,i'm not going to tell you to get rid of any fish,but you better kill this ich,because it comes back bigger and badder everytime.Good luck man