Dual tanks will they level out?
First answer is that yes they will probably level out.

But whether this recurs depends on the source of the sludge.  Simply blowing out the lines once probably will not solve the original problem.  

If you can figure out the source of the sludge there may be remedies like settlement filters (like used on swimming pools).

You might also consider a larger size tubing.  

Without more information it is difficult to give you a precise answer.

Good luck!