I have an SCA 301 skimmer on a new 40g tank. It works, but so much of the uneaten food/waste ends up in the filter sock that I wonder if it would do a better job without the sock. Does anyone have experience with this?
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A skimmer will only (roughly) pull 30% of the organics out of the water. If you have lots of uneaten food in the socks maybe try feeding less or shutting off your return pump when feeding which may help feed less. Having excess food in the sump hoping the skimmer will pull it out is a bad idea, especially if you struggle with no3 and po4.