Hi from BC, Canada...so glad I found this forum, I'm new to fish keeping & to forums 🙂 Anyway, this spot showed up three days ago on my Betta, Zora's dorsal fin, and it's creeping me out! So far it's not moving around on his fin. Not sure either, where it would have come from, except maybe the new floating plants I put in his ten gallon tank a week ago? Have since removed them to a 2nd 10 gallon tank I'm cycling. He hasn't had any other issues in the two years I've had him. Since I don't have a clue with what I'm dealing with, the pet store gave me Paraguard *their suggestion* to try. I gave him an hour bath yesterday, but I think he gets too stressed when I take him in & out of his tank because he got pale. So, can I just dose his tank w\one capful of Paraguard *he has no tank mates* but has a large sponge filter, so I won't be able to use carbon to take the med out afterwards. What about aquarium salt? 5 tbsp. for ten gallons? Or would this be too much to use all at once for him to handle? His parameters are: Ammonia - 0 or .25 ppm, Nitrite - 0, Nitrate 5.0, PH - 7.4-7.6, Hard water, don't have exact stats, Temp - 78 F, but does fluctuate in the green zone quite a bit.
Sure hope someone has seen this on a fish before and can give me some direction to getting rid of it. Just so you know, since I live in Canada many meds are not available here. Hope to hear from someone soon & thank you for your time 🙂