This is a gorgeous piece of heavy, driftwood; lots of character and shapes.

Fish can swim through it, hide in it, rest of bits - as can reptiles and a hamster or even a bird cage for a parrot.

If used in a fish tank, it needs to be left soaking for a few days to absorb water and then it will sink. 

It may need to prop to stand upright, I buried its feet in the bottom andso it stood upright with no other support.

This is big and heavy, I would suggest about a 60l tank

Widest dimensions

Width 14" or 36cm

Height: about 15/16"or about 40cm

An alternative use could be for it be covered in resin and used as an ornament. 

The grains of the wood would really come up beautifully.