What filter for breeding

Sponge filters are great for fry tanks not only to be able to keep your fry in the tank ratehr than sucked up into a HOB or canister but also for the fact that the fry can graze on the microorganisms in the sponge between feedings
 
I know this sounds a bit cheap what if i put sponge around internal filters?:idea:
 
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You really only need the sponge on the intake tube. This is only for the babies protection. (Although the post about fry eating off the filter is a good point).
 
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