Clarkiis swimming in glass

[Jrid1997]

I purchased two Clarkii clownfish about a month ago I believe the have paired up and I woke up this morning and they are swimming up against the glass in the bottom corner are they clean in the glass to lay eggs? The water parameters are normal. One is swimming with its belly vertical on the glass

 

[Lilbitreefer]

From videos I have seen on Youtube I think it is trying to lay eggs or something.