Strange RBT behavior

[Kensington Reefer]

So over the past week, my RBT has been (what appears to be) taking a massive poop as the sun is setting. During that time of day the sun directly hits the nem tank.
Tank/system background:
40gal cube and 35gal hex share a sump with ETSS evo500
Each tank has a pair of clownfish.
Water changes are every 5 days (filtered n heated natural sea water)
Nem is not target fed (fish are well fed on a laundry list of foods)

Mostly what I'm wondering is if anybody else has had similar activity with their RBT lately

 

[Kensington Reefer]

And to add
During the rest of the day it is huge and fluffy and apparently happy

 

[rygh]

Temperature issue?

 

[Kensington Reefer]

Constant 78F

 

[GDawson]

zooxanthellae build up being expelled from too much sun/light?

-Gregory

 

[Kensington Reefer]

Maybe
But it gets an abundance of natural light during the day
And it used to get the same sunlight at the same time in the 300

Again, right now it's big fat fluffy and seemingly happy

 

[sfsuphysics]

Who doesn't like to take a poo during a very peaceful time of the day?

 

[Kensington Reefer]

Good point!