I swear, I thought I had a 10, but re-measuring it, it's like a 5.5. It's heated and filtered, as well as cycled of course. The tank is nowhere near cluttered and the betta has fairly long fins, so he isn't quite as fast as a plakat would be. It's baffled and I'm planning on planting it more heavily soon. Will an environment like this be suitable long term and allow my betta to thrive fully?