06-20-2008, 12:33 PM
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Don't overlook the fact that it is nocturnal, as someone pointed out earlier. Assuming you give it caves or pipes to hide in, which you should, you will rarely see it. I've heard one technique to have them remain viewable during the day, is to put in a clear pipe or tube, and they will take up the tube as their home and you will still be able to see it. However, I'm not sure if it will be incredibly happy.
I had a BGK for about a year and a half before I returned it to the LFS (along with all my other fish, I'm moving! not unhappy with him). I have a large rock structure in my tank with lots of caves and hiding places, and in my experience he seemed to really prefer being out of the light. He would hide in the rocks all day, but not long at all after the lights would go out, there would be this black silhouette swimming around the tank! I fed mine a mix of flake food, frozen bloodworms, and live guppies and ghost shrimp. He'd nip at flakes and bloodworms that drifted into the rockwork, and I'd notice the guppies and shrimps numbers decreasing each night as he came out to hunt at night.
So, while it is indeed an awesome-looking fish, you may be disappointed with not being able to see him much, unless you give him an environment which he does not prefer (and force him to be exposed during the day when the tank lights are on).