I'd like to add a Pirate Ship to my Betta tank, but am having trouble finding one that's Betta Safe. I brought one home from Petsmart (Top Fin War Ship) but it didn't seem to pass the pantyhose test. Has anyone had any luck with the two from Petco, the Penn Plax sunken Gardens Shipwreck or the Petco Pirate Shipwreck, or have any other recommendations of one that would be safe? Or is my best bet to just sand down the sharp edges on the one I have?