08-21-2011, 10:37 PM
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Can you fill it with a coloured liquid and seal it shut and place it at the bottom of a tank as an ornament?
This is what I was thinking also. Maybe a 5 or 10 gallon with sand or very fine natural gravel, some live plants, and the skull in the middle for decoration as a home for a nice betta. You might could even rig up a small LED under the skull to light it up - as long as it is very dim and doesn't freak out the betta.
I normally like just rock, plants, and wood, but if done right a little whimsy can work in betta tank I think.