How do you know it is time to get rid of your anemone. I have a GTA. I bought him a 1 1/2 weeks ago. He never really opened up. He moves around the tank but becomes detached and falls on its face. Then I'll pick him up and put him back on a rock. I don't know when to give up on him. I don't want him to die and nuke my tank. I have read that when they die they can poison your tank.
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In my experience with trying to keep an anemone under orbits: unless the tank is relatively shallow, it's often not enough lightning.
Considering you say he's falling off the rock, I'd at least try to place him high up and with a medium flow. Because he's weak, a high flow wouldn't be the best idea for him.
If he doesn't like it up top, he'll find a way down.
Also, I've found that feeding too much, (or feeding them silversides) cause much stress and deterioration.
Do you happen to have a more recent picture of him?