Female goby has returned (again...3 or 4 days). Yesterday, she appeared briefly only for feeding time. Today, she was out and about much more. After a little observation of her coming and going, I realized that they have tunnelled completely under a 3 foot rock.
They have entrances at both ends. If you look at the previous picture, that's about where the front door is (the male goby has buried the door in the photo) The back door is right close to the back wall of the tank...about 2 feet away.
No danger of rock shifting. All my rock was placed directly on the tank bottom. They must have found a hollow tunnel under the rock.
The male goby has returned to more tolerable behaviour....for now.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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