I in herited a 12 G Nano (not DX; 24 watts only) about a month ago (already cycled) and have been revamping it; came with a Damsel and starfish + some limpets. I added a couple more pcs live rock, blue legged crabs, red-booted shrimp, brittle star, and green-striped mushroom coral so far. Was thinking of adding a purple firefish & maybe a goby (watchman or clown goby). Why didn't you like your firefish?