Just an FYI to learn from my mistake. I have used the majano wand in the past with no issues. However, recently I noticed about a dozen majano anemones and aiptasia in my 70 gallon tank. So I started using it and killing them one by one. Each one takes about 3-5 minutes. After about 8 or so, I noticed the fish acting weird so I stopped. The fish affected were a Desjardini tang, yellow tang, and a fox face. Not affected were a pair of golden nugget clownfish. I transferred the affected fish to my other tanks. In the morning, I noticed that the fox face and the yellow tang had passed. Long story short, if using this majano wand, limit how many you do at a time. After 16 years plus, still learning.