they are hiders. they usually find a dimly lit spot with good flow to sit and filter feed. try using a flashlight to look into your rockwork to find them.
I grabed my flashlight & started looking for them. I found them they were in a cave I designed for my goby. They are upside down right next to each other fanning the water. I have never seen a porceilin crabdo what they do.
That is really neat.
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