The oceans of Pisceria have been booming with bodiversity 5 million years later. Duckweed have advanced from small leafs on the water to giant masses of plants, roots dangling down into the water providing shelter for fish. Members of clades like Gouramis and Mollies reside in these masses of plants.
The Cabomba have exploded into giant tangling forests like those of kelp, stealthy predators like sharks, bichirs and cichlids stalk these dark forests. Small species of mollies have diversified into masses of schooling fish, darting away at any signs of danger in dazzling silver.
Anubias on the other hand have taken a different strategy, they grew massive in size rivaling oak trees in size. The giant leaves taking in as much sun as it can, the bottom of these giant anubias forests was dark. Large copepods and snails thrived at the bottom away from the light dependent predators.
On more sandy areas an unexpected predator lies in the sand. As a cichlid passes by it gets snatched up. These horrid jaws belonged to a Seagazer Molly! A giant species of molly adapted to ambush prey by laying in the sand.
Each and every shore was filled with nothing but rice plants, they dominated most of the shores as the tallest plants on land. However they were not the only ones, hair algae and Java moss spread wildly on land making a new biome known as “Moss Fields.”
A period of 0-10 Million Years, a sort of establishment and acclimation. While the future periods are slightly observed by beings, this one has such high monitoring. Making sure everything plays out normally, and thwarting various mass extinctions until everything could be ready. Evolution still occured in this period, with the early fishes expanding away. Rivaling the diversities in today's biosphere.
Soon after the 10 Million years are finished, the beings withdraw their protection. Letting life go without reigns, to rule the world.
(Maybe more content for this period? It's mostly as an introductionary period.)