Hey guys- this is Caii and Bo here.
I woke up this morning to find Bo extremely lethargic and skittish- exactly the OPPOSITE of how he's ever been with me so far. He's usually up and about before I even get up, and I feed him first thing in the morning. However, this morning he wasn't moving around... he's either still, hiding in his little house that he always swims through and NEVER sits in, or he's avoiding me. I spotted pale-looking skin on his head and I'm unsure if I'm being paranoid or if I have an issue I need to take care of... would you mind please helping him?
Housing
What size is your tank? 2.5 gallon
What temperature is your tank? 78 degrees
Does your tank have a filter? No..
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? A plant (Anubias Nana)
Food
What type of food do you feed your betta fish? Aqueon Betta Pellets
How often do you feed your betta fish? 2-3 pellets a day
Maintenance
How often do you perform a water change? 50% on Wednesdays and 100% on Saturdays thus far.
What percentage of the water do you change when you perform a water change? 50-100%
What type of additives do you add to the water when you perform a water change? BettaSafe Water Dechlorinator
Water Parameters:
Have you tested your water? Not yet- but I plan to take a sample as soon as I'm home from school. His water is dechlorinated tap water.
Symptoms and Treatment
How has your betta fish's appearance changed? Slight tears on his fins; losing a bit of coloration around the face- he's a little paler.
How has your betta fish's behavior changed? Now hiding in his house as opposed to being his energetic self... he dashes away when he sees me!

When did you start noticing the symptoms? This morning.. an hour ago...
Have you started treating your fish? If so, how? No; I don't want to hurt his kidneys if I can help it.
Does your fish have any history of being ill? Not that I know of.
How old is your fish (approximately)? I'm unsure; he's been with me since January 18th.
Please please please help if you can- I've already been through the disease and treatment stickies but I'm still very unsure. And this change was so drastic, I'm afraid that Bo may die... please help us. Thank you! I'll be on to check throughout the day...
Thank you so much,
Caii and Bo
P.S.- these were the only good shots I was able to take of him this morning. Thank you!