V-rex

How do you find regression levels when you have something like 5-8 adults?

I unfortunately lost the mate of adult fully grown Angelfish. Now the male is just by himself, lone Angelfish, so I would ideally like to give him company. It is community tank, but he is the boss of the tank, only other larger fish are two blue Acaras. The tank is also heavily planted so there is plenty of hiding places. I have read about that the best way to introduce new Angelfish would be to get young ones, that are clearly smaller than him. Probably 3-5 of them. This way he would not view them as threat, and no one would be singled out by aggression. However when they get older, and they form pairs I am afraid of breeding madness unless having enough them somehow helps here? I've kept other type of cichlids before, and usually having a lot of them divides aggression enough for there not be huge issues, but I do not have practical experience with a lot of Angelfish. Problem is there is a LOT of information and misinformation in the net, and doing research is hard as its often conflicting. So I try my luck with Co-op forums as Ive seen quality and effort Cory and Dean put to the content. Ive seen plenty of Dean's videos, but he doesn't of course go into this very specific scenario. But perhaps there might be people here with very long history with Angelfish to offer some guidance and thoughts. Thanks for reading this! I hope someone has tons of experience to share!

If you look at the darker areas near the top fin, its hard to see on photo perhaps, but they are like warts or moles on the top her.

Hi, I have never seen this on Pleco before, she is acting completely normally, but I noted today these warts on her back (lack of better term what to call them). I checked just in case Ammonia and Nitrate and there was no issue. Is there a chance this something normal with plecos when they age (full grown), or has she caught something?