I saw a fish in a lfs today . No lable on the tank , and no one reliable enough to ask what it was . I'll have to ask the owner next time I go back . Anyway I think I was a purple gudgeon . The fish was white/ish under neeth/ greyish/brown sides and top with blue/green and maroon/purple speckles on it's flanks ,and small iridescent eyes , made them look green .I've read of 2 types of purple gudgeons [striped and spotted ]and one is said to be endangered . It didn't lay on the bottom , it was swiming[ kind of hovering] in one spot ,I watched it for about five minutes.It seemed to be healthy . Has anyone had any expirience with these fish ? If this is that fish , what would be a good minimum tank size, what do they eat ?, water parameters [temp/ ph /fresh/brackish]?. The article I read said they get to about 12 or 13 cm[ is this true?] . Could they be kept with any cichlids of similar size , I was thinking maybe a jewel cichlid [ no mated pairs ]and /or a puffer species .My tank would have plenty of cover [plants/rocks/caves] they all do . Thanks for any advice .