Looping problem [AE&FMX]

he kirupians,

i realy got the hang of after effects now… started a little slow but the things i want i get… but now im working on those well know clouds/sky… i have the Aurora Sky plugin and i got my clounds… i even got my animation… but i have some trouble creating my clouds thus so they look like a contious movement… can someone maybe explain a trick on how to get that looping effect… ? tutorial of exaple file is kewl to…? :wink: