Nah, youre fine. I had probably half a dozen in my 4g and they were fine, just remember that they need to eat too, just like fish.
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__________________ 180g- Mostly BIG fish and some coral. ~80g Nuvo- My coral tank with "happy fish"~ 90g- FOWLR Not the not happy type of fish~ 125g- Freshwater Malawi Cichlids ~10g- Nuvo- The refugees from the Ich of '18