Decorate your fish tank with Penn-Plax Small-Medium Granite Stone Aquarium Hideaways. Although these fish tank decorations are not made from granite, they resemble the real thing. Not only do these pc. complement the interior decor of many modern homes, they also serve as hideaways and swim-throughs for your fish. These hideaways are perfect for cichlid tanks, since they're territorial fish, and must create their own space. Stack or arrange these stones however you'd like within your tank. The possibilities and combinations are endless with this set of fish tank hideaway rocks!