burrow

I recently moved from a house to an apartment in another city, and after hearing how gross the local city water was (my friend had it tested and found high amounts of cadmium and fecal matter.... yuck!) I opted to buy filtered water from the store. It was Primo brand, the kind you can walk in...

I used to have a cichlid years ago and I know they love to throw rocks around to make nests. Recently, my orange betta has been moving giant pebbles and tunneling under a shell in his tank to make a little cave for himself. Is this something betta fish do? Here's a pic of his little face poking...