He's in his new home, now!
The tank colors are perfect. One side has that castle and light blue plants that accentuate his darker red color and the other side has a dark green cave and dark purple plants that accentuate his light colors :)
He's flaring at everything, even me, lol. Can't tell if he can see his reflection or if he's just protecting his new territory. My RCS decided to come out right after I introduced him and went back into hiding when he tried nipping at her once, haha, but he seems more interested in flaring and swimming into the filter outflow.
He's super active! The tank really makes his iridescence stand out (it's greenish at times and light blue at others).