I bought that "Barrel Cave" for my Veil-Tail once, and she hated it. So I bought her a castle looking thing and she loves it!
Of course, that changes nothing about your betta just staying by the corner. Although, I do love your tank decors!
Sashimi: Red Veil-Tail Male, May 2nd, 2011 (R.I.P)
Leela: Blue/Green Veil-Tail Female, May 14th, 2011
Gemini: Pearl/Green/Red Delta Male, May 21st, 2011 (R.I.P)
& Unnamed 5 Bettas
Old fisherman never die, they just smell like it.