just make sure to read that thread all the way through..post 180 has some contradictory comments that I found very interesting when I initially read that thread some time ago and also why I recommend trying a natural setup before anything else.

I think the slurpee cup lid could offer the best of both worlds, other than i would be concerned about the sharp edge of the plastic...I know I have cut my finger straw fishing before...lol

Probably easy to just silicone the substrate right over the edges though.

http://www.nano-reef.com/forums/inde...=172053&st=160

When I have made the Slurpee lid houses I have used enough silicone that the edge is covered. I have also simply "buttered" the lid with silicone and rolled it in dry aragonite sand. I always use aquarium silicone. You can find large plastic barnacles in LFSs sometimes too which fit over the hole for a nice natural-ish look, and are usually cheap. If you use a barnacle, glue it on first and then glue the sand and rubble on around it.

I have taken a jigsaw to these barnacles making a bunch of Jawfish "doors":
http://s.petco.com/Assets/product_im...926021107C.jpg

exerpt from post 180 in the aforemetioned thread...

I also noticed that in the first video clip with the Jawfish living in the barnacle covered PVC condo that the fish was moving very gingerly when trying to grab at passing food. To me it looked as if the jawfish could easily receive a cut to it’s body trying to enter that barnacle at the normal lightning speed they usually maneuver in and out of their natural constructed homes. That jawfish seemed very uneasy and on one attempt completely missed the barnacle entrance to his man-made PVC home. Viewing this made me feel sorry for the poor jawfish.


just some extra food for thought about this.