I haven’t cleaned it yet. It should be fairly easy, and I’ll post when I do. I’m just going to siphon the water out for water changes and the tank easily comes off the wall for cleaning the gravel.

Well now I know the fish is Patrick. Thanks!

As for heat. There’s a heater a few feet below that will keep the tank plenty warm. You wouldn’t really be able to place a tank heater in it, so I wouldn’t place any fish in that need a calibrated environment.

By the way, it’s a male you have. Male and female Betta splendens are for the most part distinctively different. Only males have the long flowy fins. The females fins are quite short. I can tell from the photo that it’s a male you have.