filtration/plumbing advice

[Batray_Girl]

Hi all,
</P>I was wondering if I could get some opinions on which way I should set up the filtration plumbing on my 150 gallon. It's pre-drilled with 4 holes along the top of the back of the tank.
</P>I am hesitant about what to do because of the possibility of my tank flooding over if an internal overflow fails. What do you guys think?
</P> thanks

[Rockitmakr]

The key is not to have enough water in your sump so that if your internal overflow becomes plugged (rarely happens), it will flood your house. The 4 holes along the top, perhaps these were for your return jets?
:beer:

[Batray_Girl]

I plan on using two of them as returns. I didn't know if there were other options aside from installing an internal overflow that would be the safer.