They usually will almost tackle each other when they display mating.  I’m no expert in this realm but I always know my female is going to lay when she bites at the rocks.  What kind of anemone do you have for them?  I can’t take credit as these clowns came with my original 75g tank and with the ritteri anemone they host in.  
On another note, I’m still hoping I will get some feedback on people’s WC intervals and amounts. 
