Is hole wide inside, fish can swim through and playing there, it s a great hiding spot for your betta or other aquarium fish.
Material aquarium coral reef set is made of non-toxic and environmentally friendly synthetic resin, no any harmless to humans and your fish. It will not release any harmful substances even if placed in water for long. it s non-toxic and safe for your fish, it is suitable for salt and fresh water.
Good for your fish this is a big holes which is designed as a toy for your pet betta or other small fishes. They will be happy to swim across the hole when they want to play. And as they tired, the coral reef will be the nice place for their rest.
Easy to collocate you can easily use the Castle house with something else to create a favorite environment for your fishes as your expectation. Such as making an ocean paradise by collocate with an ocean sunken ship and the plants sway with the waves, which makes it look real.