<a href=showthread.php?s=&postid=10817336#post10817336 target=_blank>Originally posted</a> by phender
It is a little bit different because in this case it is not the anemone pigments that are missing. What's missing is the symbiotic algae that lives within the anemone's tissues.
I had the same appearance with my BTA's. The oddity is it was the clones highest in the tank.
The conditions were:
Nano tank 96watt pc's
10% water change every 2wks
Over-skimmed
HEAVY feedings homemade mixture
Target feedings 2x's a week
DSB and a fuge
78-80 degrees
Nitrate 0
The SPS in this tank grew very rapidly (as did all corals) and the RBTA on the top was bright pink with semi transparent tentacle bottoms with blueish streaks through them. Both anemones were target fed the same, but the one on top captured a considerable amount of food daily; the lower was semi shaded and received very little of the food I presented to the fish and corals (homemade mixture blended to a small size).
As we all know tank raised/bred BTA's are quite hardy and feed in three manners.
Capture passing morsels that hit their tentacles.
Zooxanthellae within the tissue
Osmoconformers absorbing nutrients from the water column.
I believe (strictly opinion) that the bleaching effect is somewhat of an evolutionary affect produced from an abundance of nutrients in captive care. A sustained but limited amount of nutrients come from the zooxanthellae, but this is also a form of natural stress through the process of photosynthesis. Absorbing the proper level of nutrients from the water column and capturing prey items (available in abundance in a tank) is easier controlled by the animal and thus may be a reason to rid itself of a lesser form of nutrient processing.
My BTA's that were bright pink grew and cloned and of the eight clones in two years, the ones that went to tanks with less food available, darkened within a few weeks (maybe 6 or more weeks). Similar conditions to mine left the BTA's bright pink as well, growing and splitting.
Remember this is a theory on observation only.