fun little cave project... sorry no pic... i'll describe.

get a basic solo cup (red plastic party cup), get a waterpaint brush and paint the cup with gorilla glue. create a mosaic with river rock, that you've rinsed well and tested with vinegar test and let dry, on the outside of the cup covering all the colored part of the cup. Let cup dry for 48 hours. put cup on the bottom with a little bit of substrate inside. you will see the white inside, but it looks fine.

you can also do this with gorilla glue and sand for a sand cave.

it's a good size for small to medium fish.
I used this for my bettas.

wow a great idea. We need a tip of the month contest like they have on another fish board I belong to. And then the winner( admins and or mods would pic a winner ) and give an award once a month

That's a GREAT idea BQ. So is this hidey hole thingy! Very cool.