well, there are all kinds of gobies, it is the largest fish family in the world. How big is your tank?? DO you want mid column, or bottom dweller. The Fire gobies are gorgeous fish that occupy mid column, but are only meant for real peaceful community. The prawn gobies are bottom dwellers that pair up with a shrimp, a prawn shrimp, and stay very small. Bith types are pretty common and range in prices from $10 for some of the prawn gobies, to about $250 for the best Fire goby. Yes there is a fire goby that is around $12.