Remove the plant from the pot and wash it clean of potting soil under the tap and rinse off the foliage. Plant in your viv or repot in a safe substrate and put it in your viv if you prefer.
As for plants, Pothos (aka Devil's Ivy), is a standard choice and it comes in a couple of different foliage colours ranging from green, marbled, to golden (rarer). It's easy to grow, propagates readily from cuttings in water, and can withstand some abuse. Can be positioned high in the tank to trail or will climb up stuff if it's rooted in a lower position. I've found the leaves tend to get larger when allowed to climb instead of trail.
Sansevieria, aka snake plants, are good tough choices as well. Robust enough to handle a White's and comes in various shapes and colours. Most varieties will eventually get too tall for your tank, but they do grow rather slow and by this point will usually have shot up many smaller leaves so you can just take it out, divide it, and put back in the shorter bits.
My American Green enjoys his Maranta, aka prayer plant, from Home Depot, but the thinner delicate leaves might get trashed by a full grown Whites.
Various Peperomia's, Draecena's, Philodendron's, Orchid's, and Bromeliad's are usually available at Home Depot as well.