Newfisher said:Thanks to you all for your positive responses to the pictures of my revised two tanks. They are still a work in progress as I add some more plants.
Newfisher said:Metal...the cave in question has the main opening of at least 2 inches. I measured it in the tank so was a bit hard to be accurate and the other openings ate about 1 inch wide. I have a cave in each tank and my fish love it! I bought them on e-bay. They come in different sizes. This was size large.