Not sure if it's a nutrient deficiency/excess or water temps. Please refer to pics. 2/3 plants are showing light green and yellow tips. New growth seems light in colour as well.
pH - 5.9 to 6.1
Daytime temp - 75⁰ to 79⁰
Night temp - 67⁰ to 70⁰
Coco with Gaia Green 444 and 284
Solved
Leaves. Color - Pale