I have 2 maroons and a bubble tip.
i think your chances of the maroons going in the nem are 100%
seriously
Its theyre host nem in the wild, and maroons are supposed to be the most dependent on nems. (my female hosted in less than 6 minutes)
when i added the juvi later on, I put the juvi in a specimin container as close to her and the nem, the female beat up the container but couldent reach the baby. when baby did get out, she beat him up baddly, but within 48 hours he was welcomed into her nem. (whitch he was risking his life for lol)
buying both on one day might make things easier since the female wont be defending a spot yet.
but get the tinyest lil thing you can, and a big one. doesent have to be a 6 inch monster or anything, but at least 2-2 1/2 times bigger
took me 6 months to find one this small. (thats a tiny 50watt heater)
heres him being let in the nem lol