Anyways, back to the original topic, since @storywriter loves marine life (I do too), a couple animals I'd also suggest would be the following:
1. Nurse Shark - I've seen them in many zoos
2. Eels - any Eel will be fine, as they sit in crevices waiting for food
3. Electric Eel - actually a Knifefish, these would be interesting additions
4. Archer Fish - my favorite fish
5. Red Tailed Catfish - a huge catfish from South America
6. Piranha - iconic animals that aren't actually hyperkillers
1. Nurse Shark - I've seen them in many zoos
2. Eels - any Eel will be fine, as they sit in crevices waiting for food
3. Electric Eel - actually a Knifefish, these would be interesting additions
4. Archer Fish - my favorite fish
5. Red Tailed Catfish - a huge catfish from South America
6. Piranha - iconic animals that aren't actually hyperkillers