Definately juvinile Rhinogobius wui, i have a couple of breeding pairs of these.
Just to make sure you know these are a cold water fish that dont do well long term in tropical tanks, room temperature is just about right for them though they will quite happily live in temperatures down to 10c. Breeding them is very easy but the fry are gits to raise as they are so tiny, for the moment i have given up with them as every batch of fry i have had have died within a week
Just to make sure you know these are a cold water fish that dont do well long term in tropical tanks, room temperature is just about right for them though they will quite happily live in temperatures down to 10c. Breeding them is very easy but the fry are gits to raise as they are so tiny, for the moment i have given up with them as every batch of fry i have had have died within a week
They are awesome
i love that last shot!!!! too cute 
Don't get my hopes up
Those guys look like great little fish