I have had my betta for about a month and a half, I change his water once a week, letting it settle for 24 hours and putting conditioner in it as well. Recently he has been acting weird, when I go near the tank he goes crazy and swims kinda spasticly, like he got scared, he makes sudden jerky movements. He doesnt seem to be eating a lot, kinda worried any imput would be appreciated! thank you