Slaine, Its not filling up so quick, this has happened over several months, also I didnt think once you have assigned an extra data file you could to change the size of it afterwards.

TerryD, This is the result of the query you suggested, I agree I could add 200 or 300 mb or even bigger at a time,

TABLESPACE_NAME Total Max Min Count
--------------- --------- --------- --------- ---------
DATA 36.74 29.32 .08 3
INDEXES 20.00 20.00 20.00 1
ROLLBACK 38.07 38.07 38.07 1
SYSTEM 86.35 86.35 86.35 1
TEMP 49.74 21.85 6.26 3