sump question

No you don't need it if you dont want to. I took mine out and just let the water drain down to the sump. I think its better if there are no filters blocking the flow.
 
If you are using a skimmer in your sump it will remove what the bag will remove and completely remove it from the water whereas the bag will just hold it in the water and that is not removal. If you use a bag it really needs to be cleaned daily or the contents are going to start breaking down in the bag and therefore bacteria will turn your bag into a bacteriological filter to use these nutrients. There are good reasons to not want this to happen.
 
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