The nice thing about Glosso is that, while it does needs CO2, it doesn't need much. Just a small DIY system will really have it taking off.
If you're not doing CO2 injection, you'll have to settle for slower growers. Lilaeopsis mauritiana, staurogyne repens, and the grassy plants like dwarf hair grass are great foreground plants. These plants also have the advantage of giving your tank a more unique look, in order to avoid the monotony of HC+glosso tanks (like mine).