Possible Fungus?

[Omboc]

Housing
What size is your tank? 14 gallon
What temperature is your tank? 78-80 F
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? N/A

Food
What type of food do you feed your betta fish? Pellets, flakes
How often do you feed your betta fish? twice a day

Maintenance
How often do you perform a water change? Weekly
What percentage of the water do you change when you perform a water change? 20%
What type of additives do you add to the water when you perform a water change? Aqueon Water Conditioner,

Water Parameters:
Have you tested your water? If so, what are the following parameters?

I need a test kit

Symptoms and Treatment
How has your betta fish's appearance changed? cotton-like patch over pectoral fin
How has your betta fish's behavior changed? I haven't noticed any changes
When did you start noticing the symptoms? Today
Have you started treating your fish? If so, how?
Does your fish have any history of being ill? No
How old is your fish (approximately)? 6 months

I woke up this morning and started watching Eustice swimming around, I noticed a patch above his fin. I've read around and I think it could be a fungus. I'll try and snap a picture to post.

How can I start treating my betta so he gets better?

[ACHVOY]

I have had luck in the past adding uniodized salt (I have all natural sea salt) to the water to rid of fungus. It was gone the next day. Some say 1tsp per gallon. I've also read 1 per 5 gal. But when my betta was in his 1 gallon (recently upgraded to a 12g) less than a tsp of salt did the trick and the fungus disappeared. I'm not an expert, but you should probably do a search and look into adding salt to treat the fungus. May help!

[Omboc]

Should I just go ahead and buy aquarium salt? Or try the iodized?

[ACHVOY]

Add aquarium salt if you don't have uniodized salt. Never add salt with iodine in it.