Have a read through this link as you will need to change its housing. Lovely markings.
Caudata Culture Species Entry - Tiger salamander
Like Julia said, you'll definitely need to move him to a terrestrial setup, or you run the risk of having him drown. Adult tigers are not known for their swimming abilities.
If you are new to caring for tiger salamanders, you may find this article helpful as well:
Caudata Culture Articles - Tiger Salamander 101