Great Hydra killer
I had a problem with hydras that somehow came in on some plants from the LFS.  I had a 10 gallon with shrimp and snails.  I did a 25% water change first.  I took a 1/2 cup of aquarium water and put one full packet into that 1/2 cup and stirred it into a milky white solution.  With an eyedropper I took 1ml of the solution and dropped it into my 10 gallon tank.  This was repeated in the evening about 10 hours later after the first dose.  I continued this for about three days until I could see no more hydras in my tank.  I did a 25% water change again after the hydras were gone.  I did not see any ill effects to the shrimp or snails.  It has been over a month since this incident and the hydras have not come back.
Rating: 5 stars