Update: One the way home I stopped at Petco and found a packet of Imagitarium adjustable valves, splitters, suction cups, etc. for $4.99. It was a pretty good price, considering they wanted .99 for one splitter by itself.
When I got home I got it all set up and within 15 minutes had bubbles coming from both tanks. Then I put a shrimp in the smaller tank to get the cycle started.
Thanks again for the advice!