Don't be nervous, it's not a problem at all. I had this concern too but it didn't cause any problems.
ORIGINAL: LJR
Just a little nervous about two clunk lines to the back of the tank. I thought they might tangle /bang into each other/some how be trouble.
But if you say it works, then I'm going to try it.
THAT'S WHAT I LIKE ABOUT THIS HOBBY- YOU NEVER STOP LEARNING!
[X(] LJR