Please explain this one

[BlueWorldAquatic]

Originally Posted by sully08

Quarentined him with about 30 lbs. of live rock, lots of flow and good filteration and did 10% water changes every week, always tested for ammonia and nitrites and there was never an issue

There is your problem, a quarentine system should be void of rock and sand.

Ich can survive on/in it when not on fish

A QT system "should" be a fresh system with places for the fish to hide, using water from the DT

Everyones QT system can vary though