I'm now uncertain about using silicone instead of an actual bulkhead...hm.
Below are some great build threads I'm using as inspiration.
Example of the 'through' return plumbing I'll be doing:
http://www.3reef.com/forums/i-made/d...cs-110234.html
Another BeanAnimal setup, painted piping:
http://www.3reef.com/forums/show-off...res-86196.html