meese-a-mew
Aquarium Advice Freak
- Joined
- Sep 15, 2012
- Messages
- 353
I think the stems might have been planted too closely and the thick upper growth is casting too much of a shadow on the lower portions of the plants.
You could always remove the entire plant, trim off the top and replant only the top and space them generously.
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I don't think the water changes are the issue. Why did you reduce your photoperiod to 6 hours? What size tank is this and what kind of lighting is on it exactly?