here are my 2 cents....I have a red tabling frag I picked up from Tyree a few months ago...up until about 3-4 days ago..super PE....then PE diminished. thought maybe AEFW, but I dipped and nothing (WHEW!!) So, upon closer examination, it appears to have gone on a growth spurt...it has a couple of new branches/tips forming, and the PE has diminished, though not completely. while handling the frag, a broke off a real small piece of the tip and glued it to a plug and dropped it in my frag tank (same system only difference is lighting my main system has 400W Radiums and T-5s, my frag tank only T-5s).
Now, the mother colony, which I believe is in some form of "grow spurt" has diminished PE. but the small tip I glued, has incredible PE..
could it be that the PE has gone down because the mother colony is using its food energy to grow? could it be that the PE is real more pronounced when it is trying to capture and store "food", but then when the energy is directed to something like say growth, PE diminishes?