I do not have any of them yet, I rushed the gourami tank I used to have and am trying not to do that again. I will be getting the Raphael catfish on Thursday and he will go in my 20L with the betta and crawfish (until the 125 gets ready).
I also meant to ask about the Heros earlier, I've never kept them before and wasnt sure about specific aggression and if the mix of 5 would be ok together.
I also don't want to be overcrowded...if I had to shorten the list, Notatus would be first, gold severum would be second.
5 Severum in a 125g would not be enough space you would most definitely have aggression issues also would put great impact on your bioload.