I had a neat idea. bury 4 inch+ wide pvc toobs part way in the subtrate to make hide-a-ways. what do u guys think.
I used the silicone and roll method. same color gravel as my tank so it blends in. just remember to put a thick coat of silicone or you'll see gaps between the gravel and sand the pvc to give the silicone a good surface to bond to. I made a tunnel long enuff to go all the way across the bottom of my tank (front to back) then used it like a barrier. one side is gravel the other is sand. the tunnel keeps the sand from getting in the gravel. but none of my fish seem to live in there regularly. the baby guppies use it for cover and all the fish pass thru it from time to time but no one seems to want to live there. guess its the open ends thing. plus its really easy to drill holes to attach artificial plants to (with silicone). ive been thinking about using the breeding grass from wal-mart since its made to be cut into whatever shape is needed. hope my two-cents can give some ideas. Lee