I think the sides of the wood are blocking the direct light. Something like Flourish Excel might be good since it's sort of an algaecide (think "off-label" use), but also meant to help aquatic plants grow. It might help make your plants grow while also deterring algae growth. They sell it in the usual pet stores, and you would need such a smaaaaaall amount. Like drops worth at that volume.
Firerrhea t1_jcz2cv2 wrote
Reply to comment by sedition- in Just Finished a Dining Room Ceiling Fixture with Planters by MTReznor18
I think the sides of the wood are blocking the direct light. Something like Flourish Excel might be good since it's sort of an algaecide (think "off-label" use), but also meant to help aquatic plants grow. It might help make your plants grow while also deterring algae growth. They sell it in the usual pet stores, and you would need such a smaaaaaall amount. Like drops worth at that volume.