Whats wrong with this picture?

[skeletoncowboy]

i have a 20g long reef tank that has been running since april. its current stocklist is, 1 yellow watchman, 1 false perc, 1 engineer goby, hermits, snails, 1 emerald crab, 2 clams. corals include, black sun coral, zoas, GSP, montipora, leather, and assorted mushrooms. everything is looking nice except my zoas...the past week they havent been opening much and its bothering me. heres my water parameters, ammonia-0 nitrite-0 nitrate-0 pH-8.3 SG-1.026 calcium-400 KH-8 PO4-0 i dont know but those numbers look pretty sexy to me

so i have no idea why they wont open? any ideas? oh! and the lighting is a 150W HQI 14k MH.

 

[reefreak29]

zoas are funny like that sometimes , you could try to run some carbon incase of chemical warfare

 

[ninjamini]

I would watch for something pissen them off. Look for a worm or snail that is annoying them.
I had a fire worm that was munchin at my zoos. I also has a sundial snail really mucking things up.

 

[snaredrum]

Mine close up when my Fire Shrimp walks across them.