For a good while now, My tree has had a lot of yellow in the leaves. This is a different tree then in my post on page 1. It's in a 2.5 gallon tank. Its been under a kessil A-150 ocean blue. I have since changed to a different bulb. A CFL bulb that's 6500-K. Are the yellow leaves due to the lighting or is it not getting enough nutrients? The tank has nitrates but always tests zero on phosphates. (Hanna 713 meter)
Edit;
A pic