Update is not good-unfortunately.
I put some pfr, orange sakura and yellows in to blue velvet contagion tank in order to give them infection. Then separated shrimps in 4x 5gal tanks and start treating them with medications in different order, amount and combinations. Used so far: Maracyn 2,E.M. Erythromycin, Hydrogen piroxide, melafix, pimafix, Kenaplex, metilen blue, malachite green, extract from IAL ,some herbs-didn't look for latin-american names.
Result:PFR and blue neos/blue dream stop dying on 2-3th week-I think that medications didn't help them. Probably their gene is stronger. Yellows and orange-every 3-4 th day one or two shrimps get cloudy and have been dying in 3-6 days. They get sick after molt or after releasing eggs. Looks like stress or when they are with low immune resistance bacteria is catching them? I don't know why all those medications can't kill bacteria. In my spectrum there are gram negative, gram positive, aerobic and anaerobic medications. Somehow shrimps won't benefit from medications. Now I start to understand why Mosura, Shirakura, Benibachi etc. are making only immune support supplements .
In positive side there are over 100 baby shrimps-so far medications and bacteria doesn’t hurt them.