2 year old Bubble in trouble

Strange thing happen the a week ago. MY bubble Tip that has been around for
2 years and split a few times decided to move to the rear of the tank into
the dark, bleach and is not starting to waste away. He has done this before
but has always moved back to the front of the tank into the light. Since he
is in the back I can not feed him, nor does he get much light. My fear is
that if he does die I will not be able to get him out without tearing down
the tank.

Tank has not changed in over a year, Everything is stable.

Water is ro/di
175 W MH
110 PC actintic
29 gallon with 10 gallon sump
DSB
Various corals with only three small fish.

ca 400 ppm
ph 8.2 -8.4
SG 1.026
Everything else is undetectable.

My guess is that it is just time for the guy to go to the big ocean in the
sky. Everything else in the tank is growing like crazy. Almost to a point
where I need to start fragging things and giving them back to the LFS.

Thanks

Ron C