So i have a 72 g. ...with 2 camel shrimp.and 2 huge mexican turbos. I am starting to see areas of buildup in the sand bed. Ive been looking at these pre packaged clean up crews online and im not all that sold on them....what does everyone use when it comes to livestock for a clean up crew? i know lots of snails and variouscrabs but anyone have specific types they like or that wokr better?