Crap I had my reply typed out and then closed my browser before I posted it. Grrrrrrr.
OK - yes super glue gel is totally safe as it becomes inert in water. Just attach the plant (hold it for a minute so it sets well) and then let it sit until the glue is dry. Then hold it under a gentle flow from the tap for a minute. Then it's safe to go in the tank. Works much better than thread cause it never rots off.
I have some pics of java ferns attached this way in the Betta Housing forum in the "show pics of your heavily planted tanks" thread that is kinda far down the page by now.
I use low light plants and don't worry about my lighting. In my bettas tanks I use the little spiral bulbs that you can get almost anywhere these days, like this: http://www.newegg.com/Product/Produc...-pla-_-NA-_-NA
and in my larger tank I just have some old tube fixture that I bought 5 years ago and haven't even bothered to replace the bulb yet. I grow java fern, anubias, swords, sag and duckweed with no problems. The ferns and anubias are glued onto natural rocks, driftwood and store bought decor and that allows me to have plants at any height of the tank that I think will look good, which adds overall dimension and visual interest. And I have zero algae.