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Coral turning dark. What causing it?


TonyInVa

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I have a Raspberry Limeade Acro and a Rainbow Monti that are darkening. All perameters are good. These two corals are on the right side of the tank. Everything else is doing great. Great polyp extention and growth is good on the left side but not on the right. Could it be flow. I think it is but not sure if too little or too much. Both sets of coral are almost directly below 250wt MH bulbs that are about 3 months old.

 

These are pictures of the right side and darkening coral. You can see the placement of powerheads. It is pointed right at the coral. There is no tissue missing

DSCN1477.jpg

DSCN1479.jpg

 

These pictures show the left side. Where coral is doing good.

DSCN1476.jpg

DSCN1478.jpg

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