I have a 20L and my current cleaning crew is
2 nassarius snails
6 ceriths
6 astreas
I personally don't like hermits because my last couple killed all of my snails and then one hermit took the other out, so I have one sniper hermit. The ones I got were electric blue hermits. I've heard scarlett hermits are more peaceful, but I can't attest to that, so take that with a grain of salt.
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