Pseudochromis Springeri

Also know as the Blue-striped dottyback.

Their torpedo shaped body is very dark grey, almost black and on their head run two horizontal electric blue stripes till behind the gills.

They're not  aggressive, but they do make a terratory and will defend this fiercely, even if the intruder is larger.

So although this fish won't need a large tank if kept alone, make sure the tank is large enough if combined with other fish.

The tank should have enough space to provide the other fishes  to swim while avoiding his territory. 

They are carnivores, so  feed them a varied diet of  live and frozen food combined with good quality flakes and pellets.