Truthfully, I wouldn't be too worried about it... I'd introduce them and just let them sort it out...What you're seeing isn't really fighting.. its a ritualized dominance practice. They'll work it out on their own. The world of gecko breeding isn't nearly as simple as "fighting or not fighting" Their struggle may leave marks.. small teeth wounds... etc.. as long as they aren't causing large wounds or tail losses, leave them to work it out on their own. 9 times out of 10 everything will settle down within 36-48 hours once they have time to familiarize themselves with each other. Every year after breeding season all my leos get moved around.. the females are put into all female groups and the males into seperate enclosures... there's always struggles between the females at first and then later on when the male is trying to reinstate his dominance upon reintroduction later on... Its nothing big to worry about really. Its leo courtship at its finest.. there's nothing gentle about it as everyone seems to expect.

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Lucien
1.1 Columbian Redtail Boa (BCI)(Sutekh and Isis)
5.11.Leopard geckos (1.2 Blizzards (Caine, Phoenix, and Mirage), 0.2 Tangerine Albinos (Tequila Sunrise ...Tiki for short, and Casper), 1.0 Tremper Albino (Mycah), 0.3 Poss. Het. Albino (Annika, Lace, and Aris), 1.1 dbl. het blizzard x tang albino (Malice, Malfeas), 1.0 Full Stripe Chocolate Tremper Albino (Discord), 0.1 pastel (Raven) and 1.2 Normals)
0.1 Savannah Monitor (Kiros) (R.I.P. November 18, 2005)
13 rats (plus pups)
2 Dogs (Loki and Storm)
2 cats (Ashe and Hercules)