Flames are nice, Ghost shrimp are a nice starter invert imo. Just watch out they can get decently sized and eat anything they catch so keep them happily fed. I use them in my guppy tanks to cull the herd per-sa. and they do a good job of catching and eating any of the slower fish, and pick off babies regularly. any any bacterial/fungal infected fish gets picked off if I don't catch it real quick. also be wary and not treat the tank ever with any copper based meds if you need to treat anything. copper kills inverts in FW as easily as it does SW.