I have a bunch of Money and Ring Cowries. I see no impact from them in my tank. They are small and don't eat much in my opinion. For eating slime algae, I found the Trocheus snails to be the very best. They cleaned up my tank very well after I added them to my tank. Most of the brown slime was gone. My tank became noticeably "cleaner" on the glass even though I already had Astreas and Ceriths and Cowries previously.
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