If they are two males then they are doing a stand-off with each other. They will be flaring fins, chasing and circling each other. All four of my males do this to each other and then begin a persuit after my poor female haha.
There aren't really any changes with the fry as such. They are big enough to fit in the breeding trap i have (not able to swim straight out the vents), and i was tempted to put them in the breeder and float them in the community tank, but one of my Cory's is ill and one of my Rasbora's is a bit off so im not risking anything. They are getting an air pump today because i believe they are finally big enough to be able to withstand a current and it'll help with oxygenating the water (so far its only been water changes two or three times per day. They are eating loads of BBS. The BBS seem minute compared to the fish now, when they were huge against them at day 7 or so.