oh so sorry i was thinking about you, waiting for update. I though it will be better. You really was doing good job for him .I am sure it was not fin rot. Not sure what the cause of him got sick, but If it external parasites like we thought , then they always present in the water environment and if fish immune system is weak then they attack the body.
Also if you never test your water i would do it. Some people have ammonia in the tap water. And even if it is it always way to bring it down and manage the care.So just check your water in case you will want to rescue another betta sometime. A lot of people on the forum saying that you can just go to the pet store and they will taste the water. He also might had something to begin with. You always have that chance to bring sick betta home, just like with all other fish or animal. You also need to disinfect the tank if you decide to bring another betta
Sorry i can't answer abut frogs maybe someone will come along to help. If not just post new thread about it.
Last edited by ANHEL123; 11-28-2012 at 11:54 AM.