Green terror queries

[Stevedean]

Hey all,
I have a question regarding my pair of green terrors recent behaviour. Today they were locking lips in an not overly aggressive manner and I was just wondering what the possible reasoning was. Both of them are usually pretty chilled out with one another and normally have a little shaking session. Male is approx 7inches female 5 inches in size. Cheers in advance.

 

[lekkiandgas]

My gt pair lock lips it's to do with breeding, if they lock lips a lot or he jerks about moving his head quick herring movements, it usually means they will breed (in my experience)