What Size Air Pump?

Switched up to a 29 gallon. Same length as a 20 long but a little wider and deeper. I have the pump, black air line, and 20" bubble stone. I have some net pots, and i'm still looking at what material to use as a lid to set the pots in. Still deciding on the medium i'm going to use, although i'm hearing a lot of good stuff about Hydroton. Planning on covering the outside with black construction paper to prevent light getting in. The only other thing I don't know besides that is how often to change the water.
 
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