gregvabch,
It's a goner. Anemones are all extremely difficult to take care of. I would say around 90% of them die within the first three months of being in captivity. The tear you pointed out will most likely not heal and it will continue to get larger and larger.
so there's nothing i can do except watch him die?
Correct.
what would the ideal conditions be for one to flourish in the home aquarium?
Nobody really knows the trick to keep anemones sucessfully. I would personally say that correct lighting, good water conditions, medium flow rates and a mature aquarium (over 7 months of age) would help in keeping them alive.
it has no xooanthellae
Here's one word that almost everyone spells wrong- Zooxanthellae (Pronounced Zoo-Zan-THELL-E) is the proper way to spell it. Just for future reference.
It looks like the foot might have been torn,possibly from pulling it off whatever it was attached to.
Seeing tears in its foot is usually a sign of high amounts of stress, although it could possibly be torn while the anemone was moving around the rockwork, or when it was plucked out of the ocean to be put in an aquarium.
i checked the base before i bought it and there were no visable abrasions or "booger looking things",
Now that you said that, the tear is from high amounts of stress.
how can you tell that it does not have xooanthellae?
Zooxanthellae is brown. White anemones usually have no zooxanthellae, and are completely dependant on supplimental meaty foods to live.
he doesn't seem very interested
Try Silver sides and lancefish. This is what they are usually fed in the wild, along with krill. Diced squid and clams are also their natural diet.
It doesn't look like has it's xooanthellae because it's white.
Well, I wouldn't say that yours has no zooxanthellae. I've seen greyish Long tentacle anemones thriving in captivity. Yours looks like it does have zooxanthellae, but I cannot really tell. A picture of the oral disc should help in telling weither or not the anemone still has zooxanthellae.
Take Care,
Graham