Take a look at
this thread . Very few have no troubles whatsoever, for the most they die within 1.5 years, others (like me) have troubles even after 2.5 years, I just don't understand them.
I have 4 different kinds of chili coral, they all do not like light, closing after it is on. I feed heavily, several times a day, and have to keep nitrates and phosphates under control in chili's tank (PO4 <0.5 ppm, and NO3 < 80 ppm), control red slime, dinoflagellates, flat worms, and use carbon, if something was wrong. Aiptasia is a problem.
Flow - disputable, I had them in both: high and medium-low flow.
What I noticed, enriched fish food (crushed flakes, Formula Two, soaked in Prime Reef and strained) helps. In addition to variety of dried micro crustaceans. Could be vitamins, or just a component, absent in dried crustaceans. But not a phytoplankton: I ried, with no reaction whatsoever, ESV dried phytoplankton, Shellfish Diet, Nannochoropsis (frozen paste), Premium Reef Blend (DT's, bottled), Brightwell Chroma-something (8-30 micron size, bottled), Kent's Chromaplex and MicroVert.
Each and everyone of them had - after the first month or so - the period of dormancy for a several months. But my tanks are not perfect. Then they opened as nothing happened and started to feed.
Having fast growing coral in close proximity may help: one of mine opened, after sun coral babies settled on it. Hormonal influence?
Still, all kinds behave slightly different, open in different time, keep open for different amount of time, have different shape and pattern of grow at the base. Two resent being hanged upside down.
In short, after tubastrea, gorgonians are most gratifying, next will be dendronephthya (some of them looks very good), if bought soon after arrival attached and not damaged, chili will be last in this line.
If I was starting now, I would buy something more good looking and having better response on the care.
Ah, the zooplankton should be preferably smaller, then ZooPlex or Cyclop-eeze, here is Cyclop-eeze, 800 microns:
while smaller ZoPlan is less traumatic:
HTH