I say they are eggs, what kind of fish do you have in there? That info would help out some, you need to know if your fish are egg layers and livebearing fish. Most fish eggs have a white almost clear color to them, but not all.

What do you mean all over the aquarium, on the bottom all over or also on the sides of the tank?

It's not algae, algae doesn't look like eggs.

You might be able to see in this picture of my fish eggs, what they look like if that helps you any. It's hard to get a good picture of them, but I think you can see them on the bottom of the tank well enough to get the idea.