03-23-2013, 05:50 PM
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I have some planted and floating Ceratopteris thalictroides. Although the planted ones aren't doing so well right now, the floater is doing fine up at the surface. At the height of my tank's health, the planted plants showed a phenomenal growth, growing up through the canopy near the cutout for the filter.
I bought them as a bunch 10 inches long and I noticed their claw-like roots - very thick and sturdy. I put them in the substrate.
The one that is floating is showing itself to be very hardy because the subfronds look like they're glued onto the bottom of the water surface. Although being attacked by cyanobacteria (BGA), the healthy fronds are able to keep from being totally engulfed.
The thing that I like the least about this plant (a true fern) is that you can't just trim it, an entire frond must be cut off if one is to avoid a lot of brown ends.