I have a 125g reef which I have the following in:
4 red hermit crabs
3 orange "halloween" hermit crabs
10-15 blue leg hermit crabs
2 emerald crabs
8 narsarrius snails
2 turbo snails
10 cerith snails
15 astrea snails
1 skunk cleaner shrimp
1 fire shrimp
1 coral banded shrimp
I considered going with only snails to avoid the hermits taking them out over time but I love watching the hermits do their thing. I especially like the red ones. They have huge yellow eyes. The orange ones are pretty cool too. If you go the hermit route you will have to periodically replace snails.
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