Scroll coral care

[BrassMonkey]

I bought my first scroll coral about 2 months ago and after about a week the polyps only open at night. Otherwise looks ok. Its at the bottom of the tank with moderate flow.

 

[droth335]

They seem to be pretty hardy corals IME. If the polyps are opening I wouldn't be too concerned about it. I have mine mid-way up under 250W MH & 80W T-5 actinics and moderately high flow. I've had it for about 1.5 years and it is growing so I assume it is happy.