04-07-2013, 01:09 PM
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I can't see any plant problems. But of course, I cannot assess the rate of growth from still photos.
Still, this looks normal to me.
Re the floating doing better, this is only to be expected. Floating plants have more light, plus the advantage of aerial CO2 which they can take up four times faster that via submersed. So this is no problem.
On the growth in general, plants must have rest periods too. I have had my chain swords since 1997 (the parent plants), and they go through periods of growth when runners appear, followed by rest periods. Each is a couple months or so, I've never really kept track. All my plants behave similarly with respect to new leaves as well as runners or inflorescences.