1. What is the size of your tank? Ten gallons.
2. What are your water parameters? State the brand of test kit used. 0 Ammonia, 0 Nitrite, 5 Nitrate (lower than the usual ten, surprisingly.) API Liquid.
3. Is your aquarium set up freshwater or brackish water? Fresh.
4. How long the aquarium has been set up? The third of this month.
5. What fish do you have? How many are in your tank? How big are they? How long have you had them? One betta fish and a few Trumpet and Ramshorn snails. They've all been in since I set the tank up, as I planted it pretty well, plus used some established filter media hanging around in bags.
6. Were the fish placed under quarantine period (minus the first batch from the point wherein the tank is ready to accommodate the inhabitants)? Only inhabitant.
7. What temperature is the tank water currently? Hovers around 78-79.
8. Are there live plants in the aquarium? Yes.
9. What filter are you using? State brand, maintenance routine and power capacity. Hagen Elite Single Sponge Filter, gets rinsed each water change.
10. Any other equipment used (aside from heater and filter which are two very important components of the tank)? Nope, just the air pump that runs the filter, I suppose.
11. Does your aquarium receive natural sunlight at any given part of the day? What is your lighting schedule (assuming you do not rely on sunlight for our viewing pleasure)? Yes, a little. Tanks comes on around 11, goes off somewhere around 1.
12. When did you perform your last water change and how much water was changed? How often do you change your water? Do you vacuum the substrate? Thursday, about 75%, as I was trying to clean off some of the algae. Water is changed at least once a week, 50% or more. The sand has the gunk siphoned off the top.
13. What foods do you provide your fish? What is the feeding schedule? NLS regular pellets, she gets about 8 once a day.
14. What unusual signs have you observed in your fish? When I got her, she had a cut on her side (where the current infection is now) but it looked like it was healing. Around a week ago, she tore part of her dorsal fin somehow, but it looked to be re-growing. The cut looked mostly healed at that point. She was fine when I left early morning Friday, but when I came back late last night she had this cottony white infection on the scar and the fin. She also somehow tore both of her ventrals. I don't know how she keeps injuring herself. The only 'sharp' objects in the tank are two pieces of driftwood, but I have them arranged to be laying on the substrate. The infection looks worse this morning, but she's still active and swimming normally.
15. Have you treated your fish ahead of diagnosis? If so, what treatments did you use? State your reasons for planning ahead of proper diagnosis. No, I'm not sure what to treat with or how.
Here's a picture of it.