I know these herps at at opposites on the char tbut I like them both. I want a red ackies but there is a mangrove in my local pet shop I want to rescue. Poor guy is almost a foot long and living in a 20 gallon long tank

I just really want to save the fellow. The viper geckos attracted me mainly for the size and cuteness, and I've been wanting to try my luck with geckos.
The mangrove is abused there as well FYI. I asked one of the employees if I could see him and he told me he was hiding. So he jammed the poor guys water dish into his side to scare him out. He knows nothing on herps, he thought mangroves got 6 feet and didn't know tegus are related (and reach a similar length). They even have a red tegu for sale.
My enclosure plans were a tank roughly 5' high,8' long, 5' wide. If you guys have better dimensions then help me out!I'll be building it myself (it will be a sectional cage broken into 2-4 pieces based on dimensions. I'll be saving for the next couple months to start the project if I decide to save him).
Also, the larger of my beardies (the female) established dominance yesterday. She did her whole head-bobbing thing.