problem with mille

[acpoweradapter]

So yesterday I bought my first SPS and its a green millepora. Well, I brought it home and put it in the tank and it looked good but the polyps/hairs never came out. Then this morning I looked at it again and out on the arms a few are out but at the base and the lower arms they are still in and they have brown looking stuff around them.. What is wrong?
Parameters
Calcium 445
Alk 12.4
pH 8
Temp 82.1
Amm 0
Nitrite 0
Nitrate 0
SG 1.023
The only livestock are two clowns and some snails. This is in one of the new JBJ HQI 28s.

 

[acpoweradapter]

Could it be the flow? I have it almost in from of one of the outputs. They are two 300 gph pumps for the returns.

 

[MACH5]

How old is your system?

 

[sigster500]

I found my milleporas liked indifferent flow rather than full on blasting from a powerhead they really polyped well with gentle blasts from all directions .. If you can get the flow correct with them they do well

 

[Bcamp]

Agree with sigster, They love flow just not a constant jet of flow.

 

[acpoweradapter]

I switched up the flow and added an extra mj1200 and them are coming out a little more but there is slime coming off them now..