I think I bought a baby Angelfish with fin rot (its dorsal fin never looked right and didn't heal once I put it in my tank like my others have) but it didn't effect my other two Angels for a while, so I wasn't worried about it. It took at least 2 months for my oldest/largest Angel to get the fin rot, this is when I began to worry, and the other was unaffected the whole time. Less than 24 hours after the first dose I could see healing on my oldest/largest Angel. I also have 2 crayfish in my tank, and they are still alive. Many medications like this would kill crustaceans.
ProsMakes the water green, but it looks neat.
Very easy instructions.
Works quickly and very well.
Does not kill crustaceans.
Waiting 48 hours between doses and cleaning means you can go about your day and not have to babysit your tank.