Planted Tank Enthusiast
Join Date: May 2012
Location: West Palm Beach, FL
Heres some general comments I have.
Lighting. You are injecting quite a bit of co2 (do you have a drop checker or kh/ph readings for us?), but using quite low light. The catalina 54w fixture only gives 50-60PAR with both bulbs on, so, with only 1 on, you are seeing half that. With co2 being injected, theres no reason you can't run both.
Ferts. Think you should tweak them.
CSM+b, you are only adding .25ppm Fe, which is close to the bare minimum. I would double this dose to 1/2 tsp.
KNO3, about right, maybe even a bit high.
KH2PO4, I would halve this dose. You are adding about double what you need for a 75g, or 2.6ppm.
K2SO4, skip it all together. You are adding plenty of K+, and and the SO4 adds nothing of value. It may even harm sensitive plants.
Micro swords, I've found, need medium to high light to thrive. Mine exhibited the same symptoms (curling and browning), when they were shaded by taller plants.
Finally, whats your substrate? Do you feed the roots? Im most concerned with the symptoms the anubias is presenting. Its a slower growing plant, and symptoms like that do not appear over night. They are the result of an ongoing deficiency. Furthermore, the plant may be happier attached to something, instead of buried. If you want the plant in that spot, simply weight it down with a plant anchor, and lay it on the substrate in that location. This is what I do, if I am not attaching it to an object.