Hi, I am a little new to being a member but I have looked at the forums for a little while, and I have a little insight for you. Depending on what you use, the plants might not float correctly and they might look a little odd. I would test it out. I volunteer at the Georgia Aquarium and they had to use fake kelp. You see kelp naturally has what is called Pneumatocysts, which are gas filled pockets which cause the plants to float. At the Georgia Aquarium to replicate this they made little plastic bubbles to float the plastic plants so that they would work and look correctly. So if you can't get them to float then you could add plastic little balls, and I know the ones at the aquarium look really real because of it.
I think the thinner the material the better for looking like aquatic plants, try to find something shiny, that would look good too.
Oh and it is pink but this would be cool maybe you could find a waterproof spray-paint and change the color?
http://www.ebay.com/itm/HUGE-9-Ft-Lo...#ht_617wt_1037
It is 6 feet of aquatic plant and cheap.
I think your idea is really good though.
Here is what the Georgia aquariums kelp looks like with the flotation bubbles.
Good luck, and hope i helped!
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