Not to worry T-man, your not alone. There are a lot of other people here on AA around your age.
It's your choice, if you take your RZ back to the FS or not.
I've had so much bad luck with RZ's. I was watching when my RZ, Sonny, jumped out and in one really fast move, he ripped the stomach out of a female Electric Blue. It killed her instantly, but it shocked me.
In 7 years of fish keeping I'd never seen anything like it. I've seen fish fight before but this was different. She was just swimming past, no fight, then just dead. 2 days later I found my male Kenyi, the one in the picture, with his side ripped out the same way. Kenny was one of my favorites. Sonny, the killer RZ, decided that half of the 55g tank was his territory and if any other fish swam near his half he didn't just chase, he killed. Because of Sonny, I went from 15 to 7 Cichlids in less than 2 weeks.
I had 2 other RZ males, as they got older they started behaving the same way. So all the RZ's went back to the FS.
I did do some research after Sonny's homicidal behavior. I found out that it's not all that unusual for a male RZ to act like that. Although Sonny was a little more aggressive that most RZ, but only a little.
It's taken almost 4 months to get my stock back up. The last 5 are in QT (quarantine tank), until they get a bit bigger.
That was enough for me to never have another RZ.
I'm kind of confused, you said "they r tiny 5th tops but my lab has none".
Did you mean, there are 5 tiny spots on your RZ and your lab has none? My guess is the RZ is male, your lab is not and I have no clue about your Acei. But without venting or even pictures, it's just guess.
Labs are definitely less aggressive than the RZ. I don't know anything about Acei, but I've heard good things about them here on AA.
I hope this helps you with your decision.
Let me know how it goes.