I recently moved my betta from the 1 gallon he has been in for 3 years to a fully cycled 2.5, filtered with 2 plants. He spends most of his time on the bottom with his head under a rock! I thought maybe the light was two much, so I replaced the 15w with a 7.5.(his first tank wasn't lighted).
He used to swim around his 1g all the time, flare his gills at people and watch whomever was on the computer. Could he just be getting old?

He used to swim around his 1g all the time, flare his gills at people and watch whomever was on the computer. Could he just be getting old?