network extender

I am running an Airport Time Capsule along with an Airport Extreme to extend my wireless network in my home. I have a fish tank control module (Neptune's Apex Controller) that I would like to add to my wireless network. This product does not have wireless capabilities, but you can connect it to a wireless game adaptor and go wireless from there? Would an additional airport express work for me?
Thanks,
Joe

AirPort Express

AirPort Express

Product No Longer Available

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