thomeski --
Your experience may be different than mine--all fish are different. But, here is my experience with Lyonsi in a 125 gallon 3 years ago?
Don't put Lyonsi in that tank with all those plants. At some point, Lyonsi will decide they're toys and just start ripping them up, pulling on them, and making a total mess out of the tank.
Lyonsi are thick, strong fish, they like to swim pretty fast, and they get mean. I wouldn't try one in a 125 again. Mine decided to dig a big nest in the middle of the tank, and nothing could swim from one side of the tank to the other anymore.
Swim fast--mine slammed the lid of the tank and killed himself.
Mine grew REALLY fast. I never measured him, but he had to be at least 10 inches. I got him at 4-5 inches from Jeff Rapps. He was smaller than other fish in the tank, couple months later he was too big to be in the tank with them and I had no place to move him.
I've had several Trimac's since that Lyonsi, and I'd say they are VERY similar--except Lyonsi grow faster. Similar aggression levels, close to same size, look similar except for color.
Get a bigger tank.
Also, if you want a breeding pair......get a bunch small and let them pair off. If Dan sends you a male and a female Lyonsi at 6-8 inches, good chance they'll never breed. If you get 6-8 Lyonsi of different gender, very good chance 2 will spawn. I have a male and female Trimac right now, and they won't spawn.