Penn Plax Large Magical Castle Aquarium OrnamentCreate an enchanted underwater world of kings and queens, wizards and witches with our Penn Plax Large Magical Castle Aquarium Ornament. This castle creates a peaceful hideaway for your fish while adding beauty and a touch of mystery to your aquarium. This poly-resin, precision-crafted, super-detailed castle includes several holes for fish to swim in, through and around. Made of fish-safe materials and colors, this aquarium ornament is ideal for fresh or salt water aquariums.