Sorry for the long post wouldn't let me edit any of my previous posts.
Here's a picture of the white thread hanging off of Oscar's fin as well as the white spot. My question is if it's a fungus and can it be treated although Oscar had treatment for his finrot the 3rd through the 13th of this month. I just did a 50% water change yesturday and His tankmate (a female guppy) died today from what I suspect was both old age and the water change. I didn't see anything hanging onto her or anything like that. She was just very lathargic the past few days though she would still swim but today she was staying at the bottom and not really moving so I moved her to a cup to observe her but she ended up passing away a hour or so after. Any help is greatly appreciated, thank you.
Here's the info:
What size is your tank? 10gal
What temperature is your tank? Between 75-79F
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? No though he used to have a female guppy on a divided side but she passed away.
What type of food do you feed your betta fish? A mixture of TOPFIN Color Enhancing Betta Bits, Freeze dried Bloodworms, Frozen Brine Shrimp and at times a guppy fry.
How often do you feed your betta fish? Once a day with a fast everyweek as well.
How often do you perform a water change? Every week or week and a half
What percentage of the water do you change when you perform a water change? I did a 50% water change yesturday but I used to do 35-40%
What type of additives do you add to the water when you perform a water change? Water Conditioner although in the past I used Aquarium salt
Have you tested your water? If so, what are the following parameters?
Symptoms and Treatment
How has your betta fish's appearance changed? Read above
How has your betta fish's behavior changed? Eats the same, swims around just fine.
When did you start noticing the symptoms? Yesturday/Today
Have you started treating your fish? If so, how? No
Does your fish have any history of being ill? Finrot
How old is your fish (approximately)? Year and a half + or - a few months
The white spot:
And the white thread:
Also a quick question: Is the white lining on the bottom of his fins show new growth?