I've been switching out the decor in Gawain's tank, and today I bought him the Penn Plax Enchanted Castle Aquarium Ornament (fitting, right? A castle for the knight). I did a very thorough pantyhose test and sanded off all of the sharp edges I could find, but it still poses some problems to me.
In the above photo of the ornament you can see one main hole in the ornament, as well as one larger one on the side that goes into the ornament. The whole thing is actually hollow, so this hole connects to a hole on the other side. However the houses and towers are also hollow and don't offer an escape hole large enough for a betta, so I'm worried about him trying to swim up one of those and becoming stuck. I don't know much about their maneuverability so I'm just wondering if this would be an issue.
It's in his tank at the moment and I'm watching him carefully. He seems content to swim through the main hole, but I'm worried about him trying out the others and getting stuck when I'm not here and awake to save him.