Green Digitate placement help

[EcoFrags]

have a green digitate that until a little bit ago was happy...i added an extra mp40 to my 180 gallon tank to get to 3 of them and now not so happy...this coral i wasnt aware had a "flow limit" anyone have any info on the subject all i can find in research says FLOW FLOW FLOW

 

[revhtree]

What type of lighting is it under and at what level?

 

[EcoFrags]

i've got it under 4ft of acan lighting LED's has been for a while now and was growing fine just started to bleach and keep its polyps out after i changed teh water flow...i moved it to a spot with less flow...it was right near the top with high flow...now its still under good light but with lower flow