Sea monkey air pump

We got a sea monkey air pump and made it out of an air stone , medical syringe and a piece of tubing that we got from the pet store.  The tubing cost 29 cents.  The air stone cost $1.29 and the medical syringe was free.  To use it you have to pull the syringe up , NOT in the water and push it down in the water and take it out of the water and do it two more times.  You have to take the air pump out of the water because if you don't, you might suck a sea monkey up!  The air pump works pretty well