overfed system with no Am. spike?

[cathoris]

Ok, this is a bit weird, but def. has me worried...

specs. first:

110 gal with 30 gal. sump.
reef setup (softies only, as there's only about 350W of light)
prot. skimmer, bag of carbon, bag of phos-lock, algone, and chemi-pure elite all in sump.
6 fish
many inverts (snails, crabs, stars, anemone, etc..)

system up and running almost a year, with absolutely NO problems.
all trace elements are great

Here's the story:

last week, I was doing some spot maintenance on the tank, nothing major, just moving a few new corals around to get a better foothold, when I knocked my auto feeder off into the h20. grabbed it quick, and no food fell out. not a prob. but had to dump the food, cause it got wet and would spoil. plus the circuitry must have gotten wet, cause I lost the display. (it's battery operated). cleaned it and let it set overnight to dry out before replacing it.
next day, i replace the batteries, and it powers up no prob., so i fill the feeder and replace it back on the tank. I leave to go to class. gone all day. come home, and don't feel very well (flu coming on), so i just get my stuff together for the next day and hit the bed, don't pay the tank any mind. next day, I'm hit with the flu and stay home. I notice that the water in the tank looks a bit.....cloudy. strange, but not totally unusual, as I do add purple up here and there, and I had added it the day the feeder fell in, I just thought the stuff hadn't cleared up.
Well, next day, it's way worse, and so am I. I suddenly notice that there's alot of, what can only be described as brown junk, at the bottom of the tank. I feel bad, but must look. Open the tank, and the feeder is empty (all the food fell in). I"m absolutely sick and can barely move, but I imediately test the water for ammonia's. nothing. 0.0 ppm. My corals look a little stressed, but I can't seem to get the energy to do a partial change, so I just leave it. Again, if i was feeling anything even close to semi-healthy, I'd have vacuumed that junk out immediately. next day comes, and I check it... water seems to be a bit less fouled, I test all the param's of the water.
Am - 0.0
Nitrates/Nitrites both - 0.0
Sal. 1.024
all other tests just fine.. Cal, Alk, etc, etc...
corals still look a little stressed but seem to be open for the most part.
Now, i've monitored the tank for a week now, water seems to be completely clear. I've seen no spikes in ANY tests, all the fish look very healthy (purple tang, maroon clown, engineer goby, blue damsel, yellow tail damsel, angel) HOWEVER, some of my corals seem to be not open for 2-3 days now.
Green star polyp - not opened for 3 days, and in fact, it's soft mantle seems to have died back a bit on 1 side
leather branch - not opened in 2 days, no polyps eating
reef anemone - spit up twice in a week, but seems to be opening again
yellow polyps/green button - very stressed... some semi-open, some not
yellow polyp stalk - not opened in 3 days.
etc, etc,...
I have tested the water every day for 4 days now, (I think), and absolutely nothing out of the ordinary.
I do not know if i should do a water change or not. I can't seem to find any reason the ammonia didn't spike or even just jump up a little bit. there's not nearly enough bioload in the tank currently to have had enough bacteria to get rid of that excess food waste efficiently. I'm not sure if I should add any trace elements at this point, or just leave the tank alone and see which corals make it. a few leathers, some polyp groups, and some other zooanthid colonies. even the xenia has shiveled up.
Is there anything that COULD be in the water, that my test kits aren't testing for that would cause this, or is there just no doubt, and I should just do a 20-40% h2o change anyway, to be safe?
anyone else run into this type of thing?
Thanks.

[tmz]

My guesses would be phosphate and nitrates from the excess waste. Or perhaps a bacteria bloom and crash.

[cathoris]

nitrates tested to 0.0... just yesterday.
water change in my future???

[tmz]

Phosphate? If it's not phosphate , it might be possible that the bacteria which bloomed and caused the cloudy water stripped the system of nutrients to the detriment of the corals.While sps like poor nutrient water,others like xenia require a little more. Just a theory. I would definately do a water change and freshen up your resins and carbon.