I recently set up an aquarium again for the first time in about 30 years! So I might as well be a newbie. Gilligan (my betta) was in a 2.5 gallon bowl while I waited for his Fluval Spec V Aquarium to cycle. He was either purchased with fin rot or developed it after being in the bowl. It had heat and a filter. I've been treating him for fin rot for over a month. I started with aquarium salt, then went to melafix, then back to aquarium salt. He has had approx 20-25% water changes every one or two days. His water parameters are good. Ph and hardness might be too high. His fin rot has never been severe. It started with a little curling, that has turned into little balls on most of his fins. During salt treatment it spread to more fins. I think it's the ventral fin, three days ago the curl was gone. Yesterday it was back again. I'm ready to go to something stronger than salt. I still have melafix, but when I realized all it was was tea tree oil I decided it probably wasn't going to help. I have ParaGuard and Furan-2. I was going to start the Furan-2 today. And I was searching for a bit of data. Here's the questions. ... the fluval has a built in filter with sponge, carbon and biomax (?) Exactly what needs to be removed while treating with Furan-2? There is a snail in the tank, does he need to be removed? Is Furan-2 safe? I've seen conflicting directions, should I follow what's on the box? There are only 5 lines of directions on the box! Ok, last one for now, would you try the ParaGuard first? Thanks to all of you who read this far and for any help!