15 gal,angel,both S. petricola,1 skunk loach.killed-otto,hatchet and 1 skunk loach.about 1 week.used old cheap walmart ichaway but now have a genaric ich control with malachite green.
Have you had the temperature at 84f in that time and you have to keep the overhead light off during malachite green treatment.
Make sure theres lots of air getting in the tank and when doing water changes use a gravel vac.
Where on the fish are the ich spots?