Eliminate stubborn black brush algae easily with Dr. Tank. Quick-dissolve formula, precise application, and visible results. Safe for daily use.
Directions: Fill a 20ml tube with warm tap water (dissolves in 1 hr). Pause the filter for 30 minutes, then use the dropper to apply the treatment at each algae spot according to the daily dose table on the packaging. The color of the algae will lighten, indicating their death, which will gradually disappear. Repeat the treatment daily if necessary. If treating for more than 5 days, perform a 50% water change before redosing.
