Possible Reasons for small foliage growth?

Hello all, I recentley replaced the HOB filter on my 10g planted tank.
The anacharis is still growing very quickly, but the new growth has
very small leaves (compared to the new growth with the old filter).
This filter creates a stronger current than the previous. Could the
stronger current be causing smaller leaf growth? The plants do not seem
to be nutrient deficient.

any thoughts?

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Hello all, I recentley replaced the HOB filter on my 10g planted tank.
The anacharis is still growing very quickly, but the new growth has
very small leaves (compared to the new growth with the old filter).
This filter creates a stronger current than the previous. Could the
stronger current be causing smaller leaf growth? The plants do not seem
to be nutrient deficient.

any thoughts?
==========================
I just checked my tanks as I have anacharis as well. Those by the current
look no different than those at the other end of the tank.
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My tanks have very soft water (ph 6.3 dH 3-5 degrees (depending on
recent rainfall), can they make it in this sort of water?

Have you changed anything with your lighting? More power? Leave them
on longer? I've noticed that the anacharis doesn't get as thick under
high intense light as it does low light. The anacharis I at my LFS is
usually a few inches long and rather thick when I buy it, howerver when
after it is planted in my tank for a few weeks, it gets very long very
quickly, but never stays as thick (I have about 3 watts/gallon).