ChiWing· Premium Member
I think a goby/pistol shrimp combo would be a great addition. They're a very neat little team to observe and won't tread into the clowns territory as they live in the sand. For corals you'll want to watch out for aggressive corals as in the tight space of a biocube they could sting other coral. As Harry mentioned above www.liveaquaria.com is a great place to research the needs of any fish or coral you're interested in.