Nasty indeed. That's why I need expert help.
My tank is 24 gallons (100 liters).
I don't know the Kelvin on my lamps, but last time I replaced the two I ended up getting one warm and one cool. I think one was called day light. Looking at them one is purple and one is white/orange. I have a feeling this might have been a stupid idea for many reasons.
I am not injecting CO2.
I add FloraPride 0-0-3 (Potassium Sulfate, EDTA, Iron Chloride, Sodium Hydroxide, DTPA, Potassium Iodine, Ammonium Heptamolybdate).
I would say my tank is moderately planted. I have a bunch of java ferns growing on driftwood and some other plants I don't know the name of. It's in the picture above. I have 12 fish in the tank (1 rainbow shark, 3 peruvian rams, 1 dwarf gourami, 3 yellow cory cats, 2 ottos, and some other smaller fish)
Thanks so much for helping!