How big to make a cave for a false personifer?

I don't know even if its a mated pair that will be sharing the same cave. If you're buying a pair online (assuming it's online otherwise you wouldn't be asking this since you will be able to see in person) I would plan to have multiple caves for them to pick and if they hang out together than that's a bonus.

As for cave size just big enough for them to go easily in and out will be fine.
 
Depends on the size of the pair say if the pair is less than 6" than the H & W is fine. I wouldn't worry too much how D but rather opening in the back for the fish to escape.

Best is to have multiple caves and let them pick their own.
 
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