Last resort to save my poor Betta and it DID!
My betta was distraught, sluggish, not eating and couldn't keep his balance.  He was clearly ill.  I tried multiple rounds of API MELAFIX Freshwater Fish Bacterial Infection Remedy and kanamycin with no visible results after a month's use.  I thought he was a gonner.  Over several water changes, I noticed little nematodes swimming and crawling around.  I learned these were planaria and though they should be harmless I suspected my betta was infected by these worms.  I used enough to cloud my 5 gallon tank like a blizzard.  Left for 48 hrs then did a 25% water change.  After two to three change the water cleared up and guess what not a single planaria detected.  More importantly, my betta started to swim upright, had more energy and was eating and keeping his food down,  After a month he was back to his ol' self!  Highly recommended when used correctly.
Rating: 5 stars