I just rescued my GORGEOUS light blue ee hm "Mist". If I hadn't thought to check on the fish at that very minute, she'd be dead. As it is, she's in shock, but alive. What did she do? She tried swimming through a stone doughnut bead that I used to anchor a piece of driftwood. These beads are available at craft stores; they're heavy, natural, colored stone (these are sodalite) that are pretty and tie easily to the wood, and are unobtrusive. I had 3 buried in the gravel (so I thought). She found one above the gravel and got her head stuck in one! I had to shove her head back out! I didn't think a betta would EVER think they could swim through a tiny hole like that! I'm going to have to abandon these stones as weights.
Just thought I'd pass along the info. Does this fish win the dumb betta contest? What other pickles have your got into? (Besides jumping out of the tank- not a bright idea, either.)