Try aipstasia and a mantis shrimp. Works for me...
Here's my 6 gallon (with 2 gallon sump) mantis tank. The aipstasia has grown in a lot since the picture was taken. I also recently added a three-stripe damsel. Everything in here is getting moved to my 13 gallon (with 4 gallon sump) nano when I upgrade that tank.
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Chilean Recipes