Rach, if providing guidance in the world of aquaria is the equivalent of becoming your nemisis, then I suggest you look up the word in the dictionary. Wait, I've done it for you.
Nemisis - n. (a)One that inflicts retribution, vengeance or causes pain.
(b)A formidable opponent and usu victorious rival or opponent.
Under the above definitions, I don't understand it's use in this thread.