Hello everyone, Two Saturdays ago I noticed a few hydras I. My tank and took immediate action. Which consisted of: 1) Siphoning as much as possible and removing any gravel I could find on them. 2) Taking out the plants (live ones) which probably were what introduced them into my tank. I placed them in different containers with alum (to remove some algae). Those are under observation. 3) Placed my betta in temporary carrier tank. He was hiding away from them. 4) I did bleach the only ornament I had in the 1/10 solution. But, I'll probably just purchase another one. 5) Reduced the amount of water in the tank to less than 50%, removed the light source and ceased putting any in the tank. I have searched the forums and around the web and would prefer to use chemicals as a last resort. Ideally, I would like to treat this with the hearing method to 104 C. However, I haven't found a method to accomplish this. So if there is one, I would much appreciate it. That said, if necessary I'll use chemicals. While I can't find Flubendazole, I have found Fenbendazole and am aware the dosing method is different. What is the prescribed water change amounts and frequency? I did read a journal on the matter but still am not too sure. Also my tank size is 5 gal, with a filter, a heater that keeps him toasty at around 80 C., 25% water changes once every 2 weeks with a siphon. Light source is LED.