Come into your shell with shell-dwelling cichlids
Garrett plans to stock his aquarium with Lamprologus ornatipinnis "Kigoma", a small African cichlid endemic to alkaline waters of Lake Tanganyika. Lamprologus spp. are one of several cichilds known as "shell dwellers" because these fish spawn in empty shells. After selecting a suitable shell, Lamprologus will "use propeller-like motions of the tail to bury the shells that they reside in." (Wiki)
Fascinating dwelling for a fascinating little fish makes for a fascinating biotope exhibit. By using some rocks in your backyard, a few pounds of sand, and a bag of shells, you can create a exhibit so simple yet so beautiful.
Here is a photo of a trio of captive-bred F1 Lamprologus ornatipinnis "Kigoma" photographed by Ray Quennelle. At Lake Tanganyika, L.ornatipinnis naturally occurs in single, pairs, or trios.