Ataeniobius toweri, adult male. I couldn't find this fish on my previous visit to Bristol, so I looked very carefully this time. The shape of the fish quite characteristic of this species, but this one's tail was not very blue. The blue scales on the flanks are a good clue. I didn't spot a female, but she should have 2 dark horizontal lines. The yellowish background is a plastic skull, ready for Halloween.
