The only major difference between the two bimac species is that one is large-egged and benthic, the other is small-egged and planktonic. I always get them mixed up, though... Octopus bimaculoides is the one with large eggs, which is most frequently bred for tank-bred animals. Octopus bimaculatus is the small-egged species. They're very hard to tell apart, so if you catch your own in California, you could get either one; it's hard to be sure unless you're getting one raised from a large egg in a tank (although experts can look closely at the eyespots and tell the difference).tywtly;95985 said:Are bimac babies planktonic or benthic? I got to thinking a minute ago, and if my bimacs breed when I get thgem, then I at least need to know what to look for in the way of babies. Thanks in advance everybody.