Totally agree with Otaku on the above. I had the same issue 3 months ago and suffered a tank crash. I misdiagnosed my tang with ich when in fact it was velvet. Wipe out the tank very quickly in one week or two. Painful lesson to learn. Since I didn’t really have any livestock left, it was easier for me to restart the tank by disinfecting everything and drying it out. Now, I take more of a preventive measures - Quarantining for 30 days before introduction to bigger tanks mainly because my livestock have gotten more pricy. In my opinion, you can slowly try out any of the steps suggested by Otaku above to eradicate ich. You might find that different tanks will react differently so if one don’t work try another. The only thing I don’t recommend is not treating them especially if white spots are visible. Typically, I will start treatment as soon as I see the them flashing or scratching themselves on surfaces. Wishing you luck with this bro and keep going! [emoji846] Sent from Singapore Reef Club mobile app