Best cuc's for softie/lps only tank

[glb]

Hi everyone. I have a 12g nano that needs some more cuc's and wonder what would be best. Right now I have a few snails and two peppermint shrimp. I used to have some hermit crabs and emerald crabs, but they seemed to be bothering the corals so I took them out. I've noticed since then that my rocks aren't as clean and want to add something but don't know what. My peppermints seem to bother my lobo. Could I just get a bunch of snails? Would that be enough to keep the tank clean? My corals are zoas, acans, a lobo, favia and a trumpet coral. Any and all suggestions would be welcome!

 

[glb]

Anyone? I could use some help on this. I don't want anything that will bother my corals, especially the lps.

 

[Reefing Madness]

Nothing is going to be 100%. But I'd stick mostly with the snails. The Peppermints are hit and miss running over corals.