I'm sorry about your Betta
Your tank looks really nice, great placement!
~ Consider a small group of Anomalochromis thomasi, 2.5-3 inches, beautiful colors, very peaceful dwarf jewels, won't dig up your substrates and do very well in planted tanks. I'm always surprised more pt folks don't keep these little beauties. Maybe its because when most hear its a jewel, they're reminded of their nasty, but gorgeous cousins. They also do really well with Corys. Maybe not so well with shrimp though!
http://www.cichlidae.com/article.php?id=53
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