That isn't blood, the red discharge around your rats nose is called porpythrin. It depends how much there is; porpythrin is normal for rats to have every once in a while; rats also get it around their eyes, too. Don't worry about it unless it appears that your rat's "crying blood" or sneezing red liquid or they have so much on their nose that it's drpping.
Its not normal AT ALL for guy rats but maybe its normal for girl rats if its a small amount but not normal AT ALL FOR ALOT OF IT !
to pump blood around the rat's body
Newborn rats generally open their eyes when they are about two weeks old.
Yes, rats thrive on blood, it is what keeps them alive.
Super rats wear capes.
Yes
== == The colour of the eyes depend on the amount of pigmentation present on the iris. Guinea pigs that have red eyes have no pigementation on the iris. The red colour is the result of blood vessels which are present in the vascular layer of the eye.
large eyes to see in the dark
All rats need to be gradually introduced to new rats before they get along. Get them out of their cage onto a neutral area, with no food around, and let them meet. do this every so often. It is normal for the older rats to show dominance over the younger ones.
the rats would eat the eyes first
if they have red or cherryish coloured eyes ( these rats are called albenos) then no.