As long as the shrimps don't look like this, you're doing good
But on a serious note, I'd avoid soft prefilter sponges like the Fluval Edge everyone recommends unless you want to clean your prefilter every 3 days because it's killed the water flow from being sucked up or too "filled". I'd get a hard prefilter sponge, the ones that feel like plastic and wouldn't feel good if you rubbed on your skin. Those you can go a long time without cleaning and they won't allow babies in (I have 60 or so CRS that are breeding nicely)
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