I have a 29 gallon planted tank with dirt and clay capped with gravel. I have 1wph T5NO. My plants have been doing great since I got them back in October and seemed to be loving the dirt. Never had any problems with them. Now since I added new plants (last week) my older plants began going downhill. :( I don't know what the problem is, don't know if maybe the dirt could suddenly be causing problems. The dirt isn't anaerobic and I don't have any problems with algae. These plants were doing amazing before this happened, they had great, healthy growth since I got them and this sudden disaster is very discouraging.
Amazon sword: leaves slowly losing all green pigment and melting out, leaving behind brown veins to make up the leaf. Slowly happening but spreading through all leaves on all the amazon swords. OR some leaves still have good green color but dark brown veins, becoming darker each day.
Dwarf sag: some blades doing the same thing as the swords, some blades just turning brown and dying.
Anubias giant and skinny (nana seems to not be affected): Getting yellow spots which spread, then once they reach the edge of the leaf it turns brown and breaks off. Some yellow is darker yellow than other spots. Thought it might be too close to the light but even with it much lower in the tank it's getting worse. Seems to only be affecting the biggest, oldest leaves.
Sword (can't remember what type): All leaves began turning brown on edges and each day the browns grows inwards
The other plants seem fine so far. I'm very worried that I might lose these plants. I tried some Comprehensive Flourish but it didn't seem to do anything. Before all this happened I had bought some (easy care level) stem plants so I was planning on upgrading my lighting this week for them (and moving the anubias to a different tank), but I shouldn't now that this is happening, right? Or would it be better to just upgrade lighting and then balance things out? I've never had problems with plants so I really don't know where to start, any suggestions would be great