Kelp in water caves/new floara
In a simple form, kelp spawns within the new flooded caves in 1.18 if they are exposed to the sun above, also within water in lush caves. You could also generate corals in big enough areas. Glow lichen and glow squids could also spawn in the darker zones.
In a more complex form, bio-luminescent plants spawn in the darker areas with similar textures and effects as the glow squid. More specifically a small glowing flower like the spore blossom, facing up not down, maybe even with a ambient glow effect. (maybe the petals could make a glowing potion). Glowing kelp and a more intense version of glow lichen.
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