Green healthy Carpet going into the dark

[tonythefish]

I have had a Green Capet for about 7 months now . It has grown from 6" to about 14" I never moved from where I placed it . I have also had urchins spawn (~ 30 in tank now ) and at least 4 of them have found there way into the mouth of the green carpet just recently. The carpet has now moved into a dark area of the tank and is about 6" in dia. Can they get sick or die from eating urchins ?

R/ Tonythefish

 

[Toddrtrex]

I have had mine eat urchins (( some fairly large ones )) and never had any issues.

What, if anything, has change with your tank? Even moving a powerhead an inch can cause them to move.
What size tank?
What lights?
What are the actual water parameters -- with numbers please.

 

[tonythefish]

I just added a 40W UV system 1 week before the move and did a sulfur swap in denitrification unit . I did feed it a cocktail shrimp 1 week ago . I usually feed it a silverside once a week

Equipment
180G dual overflow 24x24x72
55g sump with ~ 15g refuge
Etss 600 skimmer ( with carbon filter for air in and out )
5 stage ro/di
Phosban Reactor 1 cup HC GFO changed every 6 weeks
Carbon reactor 1.3cups changed every 2 weeks
Midwest denitrification unit
Mangove and chaeto in refuge
2 Hydor Koralia Magnum 6 on off switching every 2 hrs with 15 min overlap
3 Maxi-Jet 900's behind rock
Mag Dive 12 return
3 22x26 heat sinks with 40 Cree 3w XP-E's 2/1 ratio blue/white with 4 XP-G for high noon each. Total 120 leds
50gal food grade fresh DI storage

150lbs Caribsea Arag-Alive Bimini Pink
150lbs Marco rock
150lbs live rock

4 Blue-green Chromis
2 Percula Clownfish
1 male 2 female Lyretail Anthias
125 crabs and snails ( reef pack )
1 small hammer and frog spawn coral
1 green carpet
5 green star polyp
1 Brain lobo
1 large green Acan
5 head Neon Candy Cane
1 large purple Elegance
1 Garf Bonsai
3 med Green Birdsnest
1 Orange Montipora Cap
100+ mixed zoanthids

Pos 0
Nitrate <.5
Cal 400
Alk 9dkh
ph 8.2
temp 77.5 to 79.5

 

[elegance coral]

Is the UV discharging into the display? Mine has only moved for two reasons. An increase in flow, or a reduction in lighting.

 

[tonythefish]

It is discharging in to a refuge within my sump.. I did notice after UV install my protein skimmer is collecting 2x more than normal but a lighter color . I checked it out this AM and under the moon light I can see it has expanded back to a nice shape and is inching back towards the light ... So they don't like water movement ? I take my power heads out all the time to clean and I am sure they are not pointing the same all the time ...