Mertensii can get larger than haddoni and gigantea. Between haddoni and gigantea, I believe it depends on the individual anemone and the conditions it's kept under.
Meterns can get VERY big!But I dont think one will get larger then the other to be honest.Gig's may look bigger becasue of their longer tenticals but I really think as long as they are happy they will grow.So as "EC" said it depends on the tank!
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