Look, whatever you guys call it, familia, maybe? But fish are still fish. Reptes are still reptiles. Mammals are still mammals. For macro evolution to happen, fish had to evolve into reptiles, or at least mammals to come from the ocean and walk on earth. Or as you have said, back into fish from mammals. But this is not what we observe. We observe animals adapting, usually because of their environments, into a different form of the same animal. Like big cats developed into domesticated house cats. Or wolves to dogs. But there is no observable jump from fish to mammal, or even an ape to a man. The different familia, or whatever yo want to call it, couldn't have appeared all together, all at once, or that would point to creation. So obviously there are some huge missing gaps between them that only adding "millions of years," and "those fossils and skeletons have all been lost or destroyed except for a very few" can fix.