I agree with art_giacosa in that it is probably not even a crypt at all, as he says, it looks to me lika an anubias, especially when you look at the roots, a crypt normally dont have that sort of root system, and when i look at the roots, it looks like if they have the same thing as anubias roots have, that is some small white rootr threads going out from the main root, that grabs hold of some surface, bogwood for instance ...
I'm going to have to agree with Svante and Art on this one. That looks like an Anubias to me.
1. None of the Crypts I've grown or seen have photosynthetic roots like those large green ones. Anubias do.
2. Root structure: Crypts don't have the larger "anchor" roots with smaller branch roots coming off the anchors. As an epiphyte, Anubias have them all over the place.
3. Rhizome structure: Crypts tend to have a vertical rhizome with leaves coming out of a central budding region to generally form a rosette shape. Your pictures show a pretty clear horizontal rhizome with leaves coming out of one side usually indicative of a creeping-type rhizome that Anubias have.
4. Leaf structure: The strong central vein and pinnate venation is typical of Anubias. Crypts tend to have a palmate vein structure with three main veins and a webwork of branch veins between them throughout the leaf.
5. Leaf damage and thickness: Crypt leaves generally can't withstand the kind of damage your picture shows and still be healthy. The plant generally drops leaves with that much damage. On the contrary, I see Anubias with that much damage all the time.
Overall, it looks to me like some sort of variagated A. frazeri which, at the price you paid, is total steal! I buy regular small A. frazeri _wholesale_ for about $3.00 US apiece.
BTW, your setup sounds just about perfect for growing crypts, bring the light up another 4 inches and you're golden.
In a certan LFS where I live it's not unusual to see terrestrial plants being stuck in the tanks and sold as aquatic plants. At times they have more terrestrial plants than aquatic ones, all being sold as aquatic. Pieces of red painted Marginata (a true terrestrial plant) are sold as "Fire Plant" and they disappear quickly, haha.
I don't think it's an Aglaonema, I see so many of them every day that I'm pretty sure. But what is this then? (Looks more like an Anubias to me.)