Thanks FishyFloorzack, I've actually started treatment with API General Cure, as AQ salt didn't help much for my last fish. Can I add AQ salt as well, or is this inadvisable due to chemical reactivity rendering the medicine inactive? Also, I haven't noticed any clear stringy poo, so is there any reason to presume this is internal as well?
What size is your tank? around 2-3 gallons (7 gallon is almost finished a fishless cycle, but I fell in love with Logan at the petstore and bought him too early)
What temperature is your tank? 76
Does your tank have a filter? yes
Does your tank have an air stone or other type of aeration? aeration is included with filter
Is your tank heated? yes
What tank mates does your betta fish live with? none
What type of food do you feed your betta fish? a variation of different pellets, he doesn't eat much though
How often do you feed your betta fish? one pellet twice daily
How often do you perform a water change? every 2-3 days
What percentage of the water do you change when you perform a water change? 50
What type of additives do you add to the water when you perform a water change? nutrafin cycle and conditioner
Have you tested your water? If so, what are the following parameters?
Ammonia: less than 0.25, slightly more than 0
pH: around 6.8
Symptoms and Treatment
How has your betta fish's appearance changed? I have only had him for a few days, so the only difference I've noticed is a wormlike black thing hanging from his fin, surrounded by a translucent circle where the fin appears to have been eaten away
How has your betta fish's behavior changed? again, I have nothing to compare it to except for my last betta, but I noticed some flashing, he opens and closes his mouth a lot (though this may just be personality), and he has been hiding a fair bit/lying on the sand substrate
When did you start noticing the symptoms? this morning
Have you started treating your fish? If so, how? API Gen. Cure, a little over 1/5th of the packet (it is for 10 gal)
Does your fish have any history of being ill? he was a pet store fish, so I imagine it's possible
How old is your fish (approximately)? I bought him three days ago, and he's the smallest one I've ever seen for sale (he appears to still be growing).. that is all I know though.