My response to Jim:
Before you go to the trouble of designing a habitat - you might want to try
an experiment with a glass jar or tube. Some cryptic and nocturnal fishes,
especially those that are not strongly "visual," can be fooled into taking
cover by any appropriately sized solid object - even transparent objects.
Pet shops and fish stores sometimes sell glass "elbows" as shelter for such
fishes (e.g., knifefishes, mormyrids).
Swamp eels have small eyes that may be covered with a layer of skin -
suggesting "poor vision." They may do okay living in a glass house....and
the aquarium would not require re-modeling.
- Jan Hoover
Vickburg, MS
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