I think the biggest problem here for new reefers is moving the piece all over the place trying to find the 'right' place.
Make an informed choice initially and just leave it unless there is a big obvious problem (which there shouldn't be, the choice was informed, remember!).
I always picture people moving frags all over the place, causing them to close up, then moving them more to get them to open, causing them to close up!
I agree 100 % with everything you've just stated. Great post my friend.
I believe an awful lot, not all and certainly not most of polyp failure in aquaria is due to impatience as the reefer stated above in prematurely and excessive movement of new acquisition around one's tank. Peristent movement without allowing adequate time for acclimation in one spot is a recipe for prolonged retraction as a result of continual undue stress.
Regarding placement, I have always believed the previous owner is your best bet in making an informed choice for placement. Begin by always, always placing them in a QT system if possible. If not, place them on the substrate away from any rock work, away from any other corals, in line with random moderate to moderately high current but not overpowering to the point of causing retraction. This current is vital in the removal of any slim production which naturally occurs as a stress reaction. If running MHs, I would not place new aquisitions directly under your MH fixture, but east or west if possible. Tiny frags should be anchored first or the current will toss them around your tank.
As I said above, to take away some of the guessing of placement, I always ask the previous owner where they were placed in their system. Also, what type of bulb, ballast, depth of placement, how long they had them and what they feed them. I even inquire of the parameters, internal flow and turnover. These 7 questions and their answers will go a long way in increasing your polyps survival and expansion. Yes, there are many other variables which will determine survival, but the question was about placement.
I usually give new corals 4 to 7 days on the substrate before moving them up on the reef. Doing so has never failed me yet. Trust me, if your parameters, lighting, current and tank maturity are in check, your polyps will tell you where and if they are happy. Keeping in mind other agressive growing or stinging corals which might affect them in the long and short term.
One thing I would stress is not to buy into the notion that someones polyp with a name which did well at the top of their tank, will yield the same results at the top of your tank or vice versa, it's not true. There are numerous threads in this forum which dispells that myth. Every system is different than the next or previous system.
Check out this link which might be of some interest to you.
http://www.reefcentral.com/forums/showthread.php?t=1502607&highlight=zoanthid+closed
Good luck Crazyfingerz and sorry for being long winded.
MUCHO REEF
TOTM - August 2003