I have had my frogspawn now for about 4-5 months. The last few days the olyps have been shriveled and now the tissue is receding exposing skeleton. I think about the same time my xenia shrunk, but it looks like it will come back. The tank has been up and running for about 7-8 months but I have moved the tank about a month ago. Here are some stats on my tank:
18 gallon acrylic cube with 3 gallon sump integrated
CPR clone skimmer running 24/7
Lighting: 2 x 32 watt (one 10k one actinic) on 12 hours per day.
test results from seachem reef basic test kit, ca test, and hydrometer,
SG 1.024, temp 78 F, pH 8.2, Alk 3 meq, Nitrite 0, Nitrate < 0.1, free ammonia 0, Total Ammonia <0.1, Ca ~470 mg/L.
Other inhabitants: mushrooms, xenia, woods polyps, yellow star polyps, green star polyps, sarcophyton, galaxia, cabbage. hermits and snails (no fish)
Other than the xenia shrinking and frogspawn deteriorating everything else looks fine. I don't feed my tank very often since my pepermint shrimp died, just phytoplex once a week or so.
Any ideas?