Okay, last questions about the cube that we are all going to pretend I am not getting.
LOL!
All the lions and scorps typically get along. You'll have zero issues with a Fu and a Fuzzy. They are honestly the sweetest fish to each other. The only time there are issues, is when there are two males of the same species or 2 males of a similar looking species. I had a Green hawaiian that was constantly "at" the Mombasae. They are identical in shape, with the barberi being a little smaller, at that point. I'm not sure what happened, but one day it just stopped. I'm thinking there must have been a bit of a tussle or the Mombasae finally tuned around and said "ENOUGH!". Whatever it was, the barberi stopped the harassment. Problem is, I don't know if they were males, so I could have totally come to the wrong hypothesis. I'm drawing in conclusions from other scenarios, where the critters
were sexable. That's all we can do, really.
You may read that fuzzies are sexable. Don't believe it, if your are looking for accuracy. I found the original study that information is based on and I'm very disappointed. I went looking for the 411, when I found the information floating around was inaccurate in enough circumstances to become suspicious.
I had a male Red fin waspfish that was a bit of a butt to his much smaller chick. I had a leaf fish that put his mouth on the face of a fuzzy. He wasn't trying to eat him, but was ticked off at him. When my male and female Fuzzy started breeding, they were very territorial. I wouldn't put a pair together in a community tank again, as their breeding upset the whole dynamics of the tank. I think that was the first step in that tank's demise.
Those are the only 4 times I had any issue with any of these fish. I never worry about temperament as they are all peaceful. If you can't sex "whatever", it's best to only get one of that species.