Anthurium yellow leaves

One lowest leaf fading slowly can be aging. Yellowing across several leaves with persistent droop points to the growing conditions, especially roots in wet, decomposed mix.

Check moisture and root texture

If the root ball is dry and light, water slowly until the center is moist, then drain. If the pot is wet, empty runoff and inspect roots when decline continues. Keep firm roots, remove collapsed or slimy tissue, and replace broken-down mix in a pot fitted to the roots.

In a dim position, move toward brighter indirect light and expect slower water use until growth resumes. Pale new leaves can have several causes, so confirm root health and light before increasing fertilizer.