03-17-2013, 02:40 PM
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If that plant in the back is Java Fern, I would attach it to one end of the wood. With the rhizome buried in the sand, it may well rot. You can read more about this plant, and the others, in our profiles, second heading from the left in the blue bar across the top of the page. Or click on the shaded names in posts to see that species' profile.
The large plant is a sword, probably Echinodorus bleherae which is the most commonly seen species.
Other good plants would be pygmy chain sword or chain sword. [Click names for pics.] Crypts (we have a few species on the profiles under the substrate-rooted category) are another possibility, though these are more sensitive. The two swords mentioned will establish and spread rapidly.
Floating lants are always nice. Water Sprite, or Brazilian Pennywort allowed to float works well.
Are you adding any plant fertilizer? If yes, which one(s)?