Water/Coolant in tank?

Prodrive

Sunday Drivers
My radiator let go last week so I replaced it with new one. Was a bitch to bleed. Should the water tank on top of engine be full to the brim? I'm afraid to put too much in and am worried I don't have enough in. Level is about a third of the way up the tank. Car running fine at the moment but I intend to get re-map done in very very near future which will be my next topic when I sort this issue out first. On other cars level indicator for water is easy to read.
 
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