would my gold nugget L018 i think, work in a 55gal with african cichlids and a mix of small and large rock for substraite. i have a large common in with them now it has out grown the tank and i was thinking about putting it in my big tank with my aro(were my gold nugget is now) i tryed before to put them together and the common picked on the nugget. the nugget is 4" now. i like the black sand in my big tank and with how it looks with the nugget. does the L018 need sand? should i change the rocks to sand for it to work? will the change even work?