ok, so ive put this up before on this site but still am not sure. ive had 2 dominos, 1 blue devil, and 2 clowns for about 3 months now. I am about to give the little domino and blue devil to my little bro who started a 20g tank. So i was thinking i could possibly have 2 more fish but definitely 1. I DEFINITELY want a green mandarin (maybe red). but, also i would like a firefish goby. The firefish at my LFS are really small, like 1/2 inch small. So I was wondering if it would be a good idea to get both or just the mandarin. I have about 15 of live rock, and ive hand picked them from the LFS for hiding spots, so i have a lot of hiding spots. Advice would be much appreciated.