Potty Trained Fish?

Not really potty trained, but my two Mimic Tangs predominantly poop in the same corner of the tank - enough where it kind of piles up. The tank is 185g and 38" tall and they will be 30" up and drop it in that corner, then swim away. This is also the calmest area of the tank with 15 X turn over per hour.
Just never seen this before in any fish.
Funny, I've been having a lot of these "never seen this before" happenings lately :-/ Guess that is what makes reef keeping so cool.

Where do your fish poo?

 

Hey, idk where my fish poo... In fact idk if I have ever seen my fish poo... :-/

But I found an image that may cheer everybody up.

 

Ha I have a mimic tang that does the same thing matter fact what I did was cut about a 1/4 of a water bottle and put it in that corner and now he poops inside the water bottle and ever so often I empty it out so cool I thought my fish was the only one. lol

 

My Fire fish always backs into a hole in the rock-do a lil shimmy shake while they poop. Funniest thing ever

 

That... is amazing...one of the oddest and coolest things i have heard/read today!