It's really not that shallow at all. This seems like an absolutely fantastic betta tank with plenty of horizontal space to make up for the lack of vertical. Bettas essentially live in puddles, in case you didn't know. Also, you're not very aware of how our weather system on planet earth works if you really think that bettas need 76+ degrees at all times. Just preaching what I practice and we have very healthy, outgoing, energetic fish here.