Honestly, go with small gobies..nanos are hard to keep, everything is in the risk of fluctiating more than a biggert tank..dont go with any clowns of any type, they really need swimming room..being a clownfish lover myself..i can honestly tell you they like room to swim..damsels..you could try..they are very cheap and never heard of any picking at any corals..coralwise. well..zooanthids..mushrooms..it all depends on your lighting..good luck