Breeding Electric Blue Acara Tips

Hey guys ,
I have 4 EBA in my 30gal planted tank .

I have noticed two have started to pair up . I have placed 2 flat stones in each side of tank also . I have seen them swim together and shake at each other which is promising from what I read . Also they chase the other two Acara away at any chance they get .

Do any of you have experience or tips for breeding these fish ?

Much appreciated

Rick

I now have about 100 fry in the tank , nested by the parents in a pit they have dug . I removed the other 2 acara just to be safe . They should become free swimming in about another 2 days