I've heard
Pothos is a great plant for aquaria.. Just have some of the vines/roots hang in the water and it will spread like a 'spider' plant.. I am thinking about hanging one above my 100g in the kitchen and having half the roots go down inside the canopy of the tank, and then support/guide/direct the rest of the plant to go across the 'catwalk' that separates my kitchen/livingroom with the vaulted ceilings. Here is a pix example of what I would like to do.. not sure how much light I will need - heard Pothos is very hardy and will grow with small amounts of ambient light.
There are a few other live plants/ray threads.. maybe if we get some pix and more info going (
nic), we can merge them all up.
and for all you science buffs (where'd ya'll go.. LOL) check out this link on 'plantricity' that deals with electrical charges in plants and stimulation on aquarium inhabitants.. CRAZY stuff!
http://broadroot.com/content/green/plantricity0.html
PS. water lettuce and any floating lily needs a 'calm' section of a tank in order to thrive.. too much surface movement will not allow them to settle in, grow, and multiply. Rays traditionally need good movement, surface flow and gas exchange, so it makes it a bit more difficult then say the Pothos idea.