Update:
Noticed a problem...The porites around the xmas tree worms have started to bleach out and the tree sponge on that same side is turning slightly brown. I have seen the diamond goby spewing sand on both of them. Could that be the problem?
trates <5
trites 0
ammonia 0
ph 8.4
the tree sponge on the other side of the tank is fine.
Also the colt (near the problems) is also been closed for going on 5 days now
lamps on that side of tank are about 3 months old. Any ideas as to what could be happening?