No worries I can help answer your 1st question. They lay eggs first then brood the young. 2nd and 3rd question I'm not sure as my eggs keep getting eatened lol. All I can say is if u plan to breed your altifrons isolate them from others for a higher % success rate.
Ya if they are a proven pair and they mate they will spawn naturally but like others say the fry won't survive unless isolated. My Tapajos spawned twice already. I have 2 larger males and 8 females. The other females line up and try pair up with the males and it's pretty funny coz the main paired female gets pissed and fights them off of their man lol. I have 2 solid pairs going which spawned but the parents are too stupid and ate the eggs....