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Looking awesome as all of your projects seem to. A bit of my own crawfish experience to add. I've seen them eat fish that were typically active swimmers by hunting them down at night when they aren't active. So don't assume that by keeping a fast swimming and/or top dweller that they will be safe from predation. Hopefully you'll get a nice lazy one, as I've seen a range of aggressive behaviors similar to betta behaviors. I've never kept p. alleni, but I've had p. clarkii and marmorkrebs and had mixed results from each of them as far as hunting fish and eating my plants. I didn't do a definitive study, but it seemed to coincide with how much I fed them other options. You may have to feed a bit heavier than you planned and increase maintenance to compensate. As far as the digging, I never had them in anything with any substantial substrate so I can't comment on that.
 
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