Perhaps a layer of 'thick-grain' sand (or crushed coral, whatever you wish to use) may encourage more pod growth. Live rock rubble will probably allow for much more surface area than large chunks of live rock for pod reproduction, and the algae will also harbour these critters. The thin layer of sand(Im talking less than 1 inch, perhaps 1/2") (provided your sump functions correctly and removes mechanical waste before it reaches the refugium) should not become 'soiled' or dirty, and the rubble and and algae are really all you need. As aforementioned, the removal of algae that grows will provide your true nutrient export from the fuge. Also, before you remove algae from the fuge when you are 'cleaning'... give it a real good shake to shake loose any pods that are on it. TONS of pods and larvae will come off (though you may not see them). It'll feed your tank and you wont be taking any out of the system.
Cheers,
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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