A brief history: my gorgeous sorority girls arrived from QLD last night (a 1200km trip). They are all very healthy and fiesty, recovered their colour quickly and have good appetites. Last night as I was taking photos I discovered a distinct lump on my longfin red VT's side. I'm not sure what it is or how to treat it. Pictures attached. :)
I'd like to note that it wasn't obvious and that the lady who sold these to me has been nothing but helpful, and has offered me a full refund for this girl (which I have declined, as hey, I still have a beautiful and otherwise healthy fish for the rest of her life).
What size is your tank? 16 gallons
What temperature is your tank? 80F
Does your tank have a filter? 2, a Fluval U1 and a U2
Does your tank have an air stone or other type of aeration? No, but the filter provides surface movement.
Is your tank heated? Yes.
What tank mates does your betta fish live with? A sorority of 5 other females, 4 cories, and an unknown number of ember tetras, Endler's Livebearers and RCS.
What type of food do you feed your betta fish? Attison's Betta Pro, and whatever she steals from the other fish. And possibly Endler fry.
How often do you feed your betta fish? Twice per day, fasting on Sundays.
How often do you perform a water change? Whenever nitrates get above 5, or once per fortnight, whichever comes first. Usually once per fortnight.
What percentage of the water do you change when you perform a water change? It varies between 2.5 and 5 gallons, depending on how much tidying I want to do.
What type of additives do you add to the water when you perform a water change? Prime, occasionally StressCoat, IAL or Flourish.
Have you tested your water? If so, what are the following parameters?
Hardness: 1 degree
Symptoms and Treatment
How has your betta fish's appearance changed? She has a lump on her side.
How has your betta fish's behavior changed? I don't know, as I've had her less than 24 hours.
When did you start noticing the symptoms? Yesterday.
Have you started treating your fish? If so, how? Nope.
Does your fish have any history of being ill? I only got her yesterday, but I'm guessing not.
How old is your fish (approximately)? Between 3 and 6 months.