FishCr8zy
Aquarium Advice Addict
Dwarf sag will not carpet in your light. I have the same setup as you and mine grows leaves about 18" tall.
Your crypt should do great, although you should try to separate it into more smaller clumps.
Also you should pull your java fern out of the substrate because they need light and water flow to their rhizome (the thick brown root that all the smaller roots originate from). They really do best when tied onto a rock or piece of wood.
I disagree. My dwarf sag stays under 3-4" and carpeted most of my low light 10g.