We have a couple of White Throat (?) Gobies in a tank, and have noticed something wierd - now what they are doing it for - I don't know - perhaps mating
That's where you guys come in...
One of the Gobies looks like he changes colour from a cream to a dark grey, and then proceeds to chase another Goby round the tank (the same one all the time)... He then turns back to his normal colour and goes on about his business..
He then opens his mouth wide as though he is flaring at something (see pic) and goes through the process again...
Can anyone explain?
