Good advice. Before I uploaded my GEDCOM to WikiTree I tailored it using Family Tree Maker by limiting it to 13 generations so as to include all immigrants and went over it to make sure it was as clean as possible, Since I have a lot of Great Migration Puritans in my tree I was very disappointed that so much of my work was wiped out by lopping off all born before 1600 which removed many immigrants and left their children on unconnected tree fragments. It seems like more work trying to reconnect all these orphans than it would have been to find and merge their parents with existing profiles. That said, I am really enjoying the collababrative nature of WikiTree and have been able to clean up the tree segments of some orphaned profiles of families that I'm only allied with through marriage. Most of the profile managers are responsive though a few have been totally unreponsive and are slowing things down, I'm working through my list of Puritans, cleaning up their allied families and merging as I can . I've found a few profiles which are so confused I don't know where to start cleaning them up but don't think I should merge into them, possibly making it worse.