Although most plants are rooted in the gravel at the bottom of the tank, some float on the water surface, and others cling to submerged rocks and logs.
(most plants; are rooted; in the gravel) (some; float; L:on the water surface) (others; cling; to submerged rocks and logs)
most plants some others
are rooted float cling
in the gravel
L:on the water surface
to submerged rocks and logs