Keeping you guys posted lol, i added the Cardinal Tetras last night and so far so good.
Along with them i also have Watson(mystery Snail), Marty(zebra snail), 4 ghost shrimp, and 6 Cherry Shrimp. They all look like they're doing well and are healthy, including the plants(already look like they're growing!

).
However, I'm QTing Sherlock right now i noticed some fin-rot on him tonight so im gonna be treating him for that. I must've slipped up on his water care while setting up this bigger tank

. Good thing i decided not to move him over right away.
He's still very active and all so im gonna wait till im done his treatment and things settle before moving him. Should be good in about a week or so.