Humph, try the pl*cos first. Now they do have there excriment also, but it's a longer string like poop, much easier to clean up and doesn't break up as easy as O's when cleaning your gravel. I have had problems with crawfish in the past, or should I say they have had problems with my Oscars. I have not been able to find a big enough or tough enough crawfish to hang with my O's! Not even the smaller O's like 4-5" I think this is the equivilant of garfield to pasta(don't know how to spell laseinga). One of their delicacies, ya know! You can try and see but they eat the crawfish. Trust me it will be an awesome display!
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Chuck
www.kickstart4@aol.com