While flaring is a sign of aggression and I'm pretty sure they become more aggressive as they get older, some seem to just like to flare. Check out the link below, which explains that maybe your betta is seeing a colorful object that he thinks is another fish or maybe he's just "peppy"! I hope...
Are you wanting to teach elementary school? If not, what how are you planning on using an ESL degree? Have you considered a double major so that you could teach elementary school and use your ESL or do something with ESL such as interpretation in an area with young children. As a teacher, I...