CAN I GET BY FEEDING MY ARO'S JUST FREEZE DRIED KRILL AND BLOODWORMS(DOES THAT PROVIDE THEM WITH THE NECCASARY NUTRITION?). I CAN NOT GET THEM TO EAT ANYTHING ELSE EXCEPT LIVE FOOD.
No, once they are bigger the blood worms and krill will not be enough. Getting your aros onto a varied quality diet while they are smaller is important. Keeping them off live food is also a good idea.
Get them on a quality pellet as their main diet. Your aros and your wallet will thank you in the future. Most aro owners have to resort to starving their aros before they will accept pellets though. Some take longer than others, but mine only took 24 hours before accepting pellets. Since yours are already 8 inches, I would think its ok for them to be pellet trained and starved if necessary. You might get more tips if you post this in the aro subforums.