I have a 15 gal with two clowns one fire shrimp and two clown gobies one yellow, one green. I desperately want another fish but my female clownfish is a butthole. She sometimes bullies the shrimp but its not that bad not bad enough that he comfortably comes out for feeding and comfortably molts every few weeks. Same as the gobies except sometimes I spot the yellow goby on the clownfish territory. Are there any other tankmates I can get? Or I am done. I had a two tiger watchman gobies, one died so we got another and the second died again so wer'e not trying those again unless it's a bigger tank. But since fire shrimps are small could I get another?