I have a Betta (named Neptune) that I'm having trouble determining the age of. He is a rescue that originally was owned by family of a friend (he was kept in about a gallon with no heater or filter as well as water changes only every few months). Bettas are about 5-6 months old when at stores, they had him about 4 months my friend thought, and I've had him since September 25. So he should be about a year to a year and a month old. It doesn't seem like it though. His fins are bent and curled at the tips, you can see the broken rays, and he isn't very active unless I'm around or he's building a bubble nest (he is in a heated and filtered 10g with plenty of things to do). This tells me he is probably older than that. Any guesses?