What Plants For Semi-herbivorous Fish?

I'm considering sailfin mollies and have read that they do like some vegetable matter with their other foods. If I go this route I'd like to have some plants that they can munch on when they get the urge and not have to wait for me to throw in a wafer or some zook.
Any ideas on what they might like?

 

Try harder leaf plants like Anubias, swords, etc for plants they probably won’t eat. For plants they would eat, try floaters, stem plants, and maybe moss

 

Roots from Amazon frogbit and dwarf water lettuce are a favorite for many of my fish.

 

Roots from Amazon frogbit and dwarf water lettuce are a favorite for many of my fish.

Will those tend to take over the water surface pretty quickly or are they slower to spread? I have Brazilian Pennywort and the Pearl Gourami seems to like hiding in it but it hasn't shown any propensity for spreading, though I have only had it a few weeks so far.

 

Nope, they won’t take over. They grow relatively fast, but not that fast. Not like duckweed. The roots can grow very long, but when I’m out of town for a few days, I come back and they are all eaten to the base. I like seeing that, as it’s nice to see fish forage naturally.

 

Nope, they won’t take over. They grow relatively fast, but not that fast. Not like duckweed. The roots can grow very long, but when I’m out of town for a few days, I come back and they are all eaten to the base. I like seeing that, as it’s nice to see fish forage naturally.

I don't know if you saw my thread about Hornwort, I bought some and then wasn't happy with it. I thought it was a floating plant and it's more of a neutral buoyancy plant, it just kinda hovers in the water column. Sorta near the top but not really ON top. It just looked bad.
The Pennywort on the other hand looks good, floats, and stays in place - the flow in my tank is such that it pushed it all to one end, which I like. It makes a mat about 3-5" thick.
I wouldn't mind having something that wasn't quite as thick of a mat, do either of the ones you're suggesting do that? Could you post a pic maybe of the whole tank so I can get some idea of what it looks like or with some reference for size etc... I wouldn't mind so much roots dangling even if they were pretty long, just so the plant mass itself was confined to the top 3 inches or less at the top. If the roots dangle 6" I wouldn't care I don't think.

 

Frogbit aren’t that big. You’ll notice that in the photos. I don’t have dwarf water lettuce anymore, nor any pics, but they grow similar to frogbit in that they’re surface plants. But don’t let the word dwarf fool you. They can get quite big in the context of an aquarium.

Sorry I don’t have any real good topview pics. I’m home away from home right now, so I’m just posting pics that I have. These are all frogbit.

 

I like the looks of that, I might give that a try. I see my Platies nibbling at leaves sometimes but I'm not sure if they're eating the leaves or something that is on the leaves. I think it's the latter but am not sure. I don't see any holes though.