Sponge on pumps?

I run a sponge on my skimmer but not one the return no wait there's one in the return pump so I guess I do run sponges on the pump lol
 
Like any other filter media if you don't clean the pump sponge every 3-4 days it will start to increase the nitrates in your tank. Too much work for most of us who go without it.
 
I have four rbtas and they are very healthy. I only put sponge in one baffle of my sump to prevent snails getting in to pumps. Otherwise I run all pumps sponge free.
 
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