The ones we kept for a while in our aquarium sure liked to stay in holes just like the picture you have.

We took a half height concrete block (as opposed to the big standard ones)that has the three holes through it (same size as a cap block but with holes). We sawed it in half with a tile saw and put one half in the aquarium. They practically lived in those holes. One would stake one hole out as his own and run the others off. There were three holes and four FHM so it was kind of musical chairs. Funny to watch. They will hit the surface with gusto for floating food.


Edited by snrub (02/13/14 03:06 PM)
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John

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