@sfin52
How can a toxin affect one BTA and not the other? Any toxin affect one animal will affect the same to another of the same species, because for all practical purpose they are the same. Even human with all out genetic knowledge cannot produce a toxin that affect one person not the other. This is only stuff of science fiction.
In order to be able to do this, the toxin need to be "smart" and differentiate anemone from the other.
We have cells in our body, not molecules, that recognize self vs non self. These immune cells would attack and neutralized cells in our body that it sees as "non-self". This is too much to pack into a molecule of toxin. Anemones have nematocysts that recognized non self and would fire them when it come in contact with other animals. Anemone does not sting itself because of this fail-safe mechanism. This in in direct contact, not release into the water.