Question: Removing elements in a list

I have a list X:=[seq(i, i=1..8)] i.e. X:=[1,2,3,4,5,6,7,8]

Say I have a separate list containing for example t:=[2,5,6]. How do I remove these from my original list leaving me with X:=[1,3,4,7,8].

I have been trying subsop(t=NULL,X); however I only get the error message "Error, invalid input: subsop received (1, 2, 3) = (), which is not valid for its 1st argument"

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