having a problem with my corals not opening to much

[Lionfish]

anybody out there.. that could give me some advice on why it'snt my corals opening as good as they look at the petstore.... example: my acropora's won't have they polyps out... it's it phosphate nitrates? anybody knows..... and how do you fix that problem any ideas anybody.
thanks

 

[jordan banks]

Start with checking your water parameters let know what they are and I can help you

 

[Dalmatia]

Bump
And what lighting are you using?

 

[Lionfish]

I'm using metal hight lights....

 

[Reefing Madness]

Ok, Metal Halides, what wattage, what kelvin is the bulb? How high off the tank? How long are your lights on? What lighting did the corals come from at the LFS?
What are the following parameters on your tank?
Ammonia
Nitrites
Nitrate
Phosphate
PH
SG
Temp
Cal
Alk
Mag

 

[Dalmatia]

We can't help you anymore with out your parameters :/