Hey guys, first time on a forum and looking for some help and or info, i currently have a red Betta named gimbal and ive had him for roughly 6 months and had absolutely no problems, hes extremely active eats often and seems extremely happy, however that all changed recently, we had him in a 3 gallon tank and decided it was time to upgrade him, the 3 gallon tank had no heater, as we live in an area with a constant temperature, and the most the temperature has ever dropped in his tank is 1F, he also has a filter and is fed once to twice every day. Anyways we recently wanted to get him a larger tank and some tank mates, this is where it gets interesting, hes now in a 10 gallon tank with a filter, no heater still and the tank temperature hasnt dropped or raised (wondering if thats the issue) and 5 small Glowlight Tetras, the first day he was shy, and a bit terratorial but never aggressive, and i thought all was well, watched for a while and saw no issues, and went to bed. fast foward to day 2 and 3, the fish are co existing perfectly fine, but hes starting to exhibit some weird behavior, he was hiding behind a piece of coral today when i woke up and i assumed he just felt shy or nervous due to his new tankmates, no other issues on day 3 observed. Day 4, he has now decided to reside at the top right corner of the tank, flaring at himself and never moving, he also goes dormant every 30 minutes or so and stays entirely still, im assuming hes just resting, im just concerned about the fact he wont explore the tank, or move from the top right corner, the other 5 fish are on the bottom swimming around and playing, just not him. any ideas?