Sounds like they are not getting enough nutrients.
Are you adding ferts?

Marc
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On Tue, 2 Nov 2004 19:11:50 -0800, "Ook" wrote:

I have hornswort and frill in a 15 gal tank. Both plants just sit there,
they grew a lot at first, and then slowed down and now they are just sitting
and slowly turning yellow. Is this part of their normal life cycle? Is there
anything I can do that won't kill my neons that would help the plants to
grow?