On Saturday (tomorrow) I will be taking 1500 pts. of Tyranids for the first time ever against a Chaos army.

I know very little about Chaos and was wondering if some of you could give me some general tips on what would work best.

For instance, having been playing against Imperial Guard with my Tyranids recently I have usually taken 3 x 17-20 standard Hormagaunts without any biomorphs. Chaos I know are similar to Space Marines in that they have good armour saves and also better WS and Toughness than Imperial Guard so it would be helpful if somone could give a few tips regarding whether the standard troops need biomorphing to engage the Chaos effectively.

Also any other suggestions regarding other effective Tyranid creatures to take against Chaos would be welcome.

Thanks

Dio