Usage instruction
Linking a oxygen pump，adjust it to suitable，then the bubble holds up
the shell and you will get a wonderful vision.By the way，put some sand
and stones into the groove of the shell to prevent it floating.

Specification：
-Material:Friendly plastic
-Size:10 x 5.5 x 6.5cm

Feature：
-Brand new and high quality.
-Bubbling and moving shell.
-Make your fish tank more beautiful. 
-Safe for all aquatic life.
-Cleansing water and increase oxygen.

Note: Pumps and pipes need customers to purchase themselves.

Package Included:
1 x Closing shell decoration