Over the last couple days I have noticed my nice growing colony of LA Lakers start to die off. I was quite confused because it was looking so healthy. About an hour ago I went out to let the dogs out and decided to take a peek at the tank. Even with the lights on low I could see something on the my zoas. I turned it on and there was a huge amphipod chowing down on my zoas!! I have one polyp left and put it up on the frag rack to get it out of harms way.

Now here is my question. What fish could I get that would eat these things, but no out compete my mandarin for copepods?
I have a 29g biocube with a lid stocked with a pair of clowns, a green mandarin, a little clown goby, 2 peppermint shrimp, snails and a couple hermit crabs.

I was thinking a wrasse of sorts, not a 6 line, maybe a flasher.

Any suggestions?

Thanks
Burke