I replaced the bulb with a 23W 6500k. I also put some osmocote under the sand. So far it hasn't raised the ammonia (I did a test with osmocote in a cup of water, and it raised it pretty quick, but in the tank it is more diluted plus under the substrate)
No fish or invertz, so it doesn't matter anyway.
The Rotala has definitely grown, and the moss is slowly expanding. I put one sad little E. tenellus in there and it has sprouted a new leaf.
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