Yes the one on the left the double cave we just used some silicone and some of it shows at the angle I took the picture you cant really see it if your looking at our aquarium. The other one is a bunch of different pieces together that make caves/ledges for our fish. It is our 2nd one and it looks really good in person, people ask us where we got it. Very easy to make with some slate from home depot ~$7 for a couple sq ft. And silicon from walmart ~$5.is that just peices of slate?
Mike