your FG will be lower.
Normally when you are doing an extract batch you want to put all the wort into the carboy first, then top up to 5 gal.
Also... now that you're pretty much at the top of the carboy, you will for sure need a blow off tube or you will have a blow out , they're always fun!
RAINYDAY BREWING AND WINERYSoutheast Portland, OR - EST 2010Primary
Straight lambic - Rose hip'd saison - honey mosaic wheat Kegged
Empty - Empty - Empty - Empty - Empty - Raspberry Chocolate StoutComing up
80 shilling - Schwarzbier - Bavaian Heff
Electric 120v Brutus 20
Homebrewers are like drunk Rembrandt's... Painting the world with liquid love
If you're getting into this hobby to save money... you have a great sense of humor