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I'm on my phone at work and researching it would be a pain but I'm pretty sure that mo creatures has not yet been updated to 4.x. Not familiar with the Tropic one.
It would have to be a manual add on the user's part and no server is guaranteed to add them. Plus MO adds so many critters you might bog down your game
i intend to attempt adding mo's on my server when the time comes to migrate.
that however isnt possible before we hit a stable release with redpower 2, far too many players seem to resist an update if it means starting fresh with most of their redsotone destroyed and impossible to rebuild afterwards.
i really should experiment locally for now but thaumcraft 3 is eating every free moment i have right now