GNAAAR
Aquarium Advice Regular
- Joined
- Jan 2, 2017
- Messages
- 80
Looks like a deficiency to be honest, that would explain the algae on the glass as well, what light and fertilisers are you using?
From what I've read, swords are heavy root feeders. You might want to try to pick up some root tabs and shove them under the substrate near the swords and see if that starts to help.