Behaviour and Compatibility
This fish is very docile and poses almost no threat to any other stock inhabiting a typical marine aquarium. This passiveness makes it a perfect tankmate for delicate species like sea horses or pipefish. In fact, it is in reality quite shy, and when first introduced into an aquarium, may take up to several weeks before it is bold enough to leave its hiding place, or bolt hole. Whilst this fish can display aggression towards other tank inhabitants by opening its mouth and "yawning" at them, this is mostly show, and the goby will quickly turn tail and hide if confronted.
The goby will spend most of its time hovering about two inches above its bolt hole, searching for scraps of food in the water column. If scared or startled, it will slowly retreat towards its hole. If the danger does not go away, it will dart inside at lightning speed.
Mated pairs of this fish are very rare and difficult to attain. Individual males may fight if placed in a tank smaller than about 50 gallons (~200 litres).
Read more about this topic: Black-ray Goby
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