My plants are turning yellow

I would say NO3 deficiency. Usually K+ deficiency manifests as pinholes and small yellow spots, but not yellow leaves. Are you macro dosing?

www.gregwatson.com buy them dry and cheap. NPK and CSM+B with that much light and CO2, your plants will not flouish without ferts.
 
I am new to aquatics, but in terrestrial plants, N deficiancy would be a yellowing of lower leaves moving up the plant with the other leaves usually turning a lighter shade of green until they yellow. That would be by far the most common. Other macronutriant deficiances with yellowing would be:

Magnesium deficiancy wil show up as yellow leaves, often starting from the tips and new growth may be yellow with dark spots.

Sulfur deficiancy will turn new growth yellow while older growth remains green.

Even more rare would be micro nutriant deficiancy from zinc and manganese that could also cause yellowing starting near the veins. Molybdenum looks a lot like nitrogen deficiancy, with yellowing older leaves and lighter green newer leaves, usually with the leaves starting to deform.

I would definatly start with a basic NPK (nitrogen phosphorus potassium mix) fertilizer. All three nutriants are heavily needed for growth, thoug hin differnt quantities. follow the directions for it, overdoing it can be as bad or worse as underdoing and differnt brands will have differnt ratios. give that some time to work and if it doesn't you might need to look at one of the other nutriants as the problem.
 
:bday: wow there is a wealth of info on here now to help with your yellow pants...
 
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