Looking for some cool shrimp mainly , I have some of the basic hermit crab, a couple snails, this one flatworm eating shrimp, but He is a huge hider, I thought he died in my 15 gallon within a day but as I was moving stuff I saw him huge and jumping around. So I wanna know if theres any cool inverts that are out and about and social if that makes sense. I am planning on an arrowhead crab, was thinking maybe a cleaner shrimp or a coral banded shrimp. I do have alot of caves and arches and hiding holes so I dont think I need to worry about aggresseviness? For fish im avoiding anything that would pick on them, but atm I have a peacefull damsel, 2 clowns, planning on getting a pink streaked wrasse, I want to get more fish as well but at the moment I am not focused on fish