After soaking the pellets and frozen mysis in garlic guard for 20 min I would feed. The tang was eating everything. For several days it would have spots only when the lights came on. Today will be one week of galic guard and no spots this morning. The tang never once lost its appetite. I blame the ick on myself. I added way to many fish at once and it stressed it out. All stable now. Good luck with your tang, keep it eating.