All your Crypt should grow fine. I have Cryptocoyne (Wendii Red) it grows well in my low tech tank with a 15 watt. flourescent. I do not have Co2 either. I used to have all plastic plants. I switched them all out in all my tanks to low light plants below that I got from a friend that has low light, not Co2 also.
Cryptocoryne, Vallisneria, Java fern,Moneseleum Moss (Pellis), Wendolov Java fern, Java Moss, Hornwort, Chain Sword sagittaria, Riccia (Cyrstal Wort), Wisteria,Water sprite, Guppy grass
In low light the Water sprite does not get the split leaves but are fuller whole leaves. I have some floating also in my tanks. I do have a sword plant but I have to put root tabs in for it to grow better. Any plants that have red leaves that you get will not grow good in low light. I did get some plastic red plants to mix in the background with my live plants for added color.