Cora, one of my sorority girls, is dead. I quarantined her two days before she died, but she had dropsy. I also quarantined another girl who didn't look well; she now has the raised scales and bloat; she did not when I put her in quarantine, and neither did Cora. Please help me make sure it doesn't happen again: I'm heartbroken at the thought of the rest of my sorority girls dying. Thank you.
What size is your tank? 10 gallons
What temperature is your tank? 79 degrees
Does your tank have a filter? Yes
Does your tank have an air stone or other type of aeration? no
Is your tank heated? Yes
What tank mates does your betta fish live with? Female bettas
What type of food do you feed your betta fish? Hikari betta pellets (no live foods whatsoever)
How often do you feed your betta fish? 3-4 pellets once daily
How often do you perform a water change? Every 4-5 days
What percentage of the water do you change when you perform a water change? 60%
What type of additives do you add to the water when you perform a water change? None (well water)
Have you tested your water? If so, what are the following parameters?
Symptoms and Treatment
How has your betta fish's appearance changed? Cora had popeye before developing the raised scales; both Cora and Dakota were darker than normal and had long vertical stripes of dark red around their faces.
How has your betta fish's behavior changed? Lethargic
When did you start noticing the symptoms? Sunday or Monday
Have you started treating your fish? If so, how? No (I have no idea what do besides quarantine!)
Does your fish have any history of being ill? None whatsoever
How old is your fish (approximately)? Between 1-2 years
Is it safe to use the siphon I used at their last water change? And if not, how do I disinfect it? Thank you so much for your help.