I am hooking my mom's betta up with something better than a 1 gallon hex and want to provide a cave for the betta (which they seem to require) without moving that stupid little castle into the eclipse 12 that i am cycling for her. any ideas on a diy cave design? i havent found any good driftwood with a nice pocket in it and seaching the web gets me goofy designs based on gluing sparkly rocks to a candle holder. not too natural looking. i have some nice palm trunk and cork rounds but they float far too well. If i could disguise PVC, without using blingy rocks, then that might be okay.