Thanks for the info!

Please excuse my ignorance, but what is a "closed loop"?
"Xerces" wrote in message
...
I have a 66gal tank that is drilled. It currently only has two holes;
overflow and return. Do yourself a fav and get at least 4 done. Two
overflows and two returns. (S)he how laughs last had a backup!

I have had a few wet floors from a clogged overflow. Next time round I
will have a total of 6 holes. Two overflows, two returns and a closed
loop.


Regards,

Xerces

On Sun, 20 Feb 2005 20:01:05 -0500, "Flyboy" no
wrote:

Hello Everyone:

I have a 135 gal tank which is dormant (dry). I was in the hobby a few
years
ago and gave it up. Now, I'm thinking about getting back into it and would
like to try something different. To get the flow I need, I'd like to drill
a
hole (or two) in the bottom of the tank and build an overflow box
(internal).

Q1. Should I have two holes? (one on each side)

Q2. Should I have the return come back up through the overflow? (I was
thinking of putting the return on the other side of the tank)

I've seen some different configurations and was wondering what is the
right
thing to do. I figured some of you probably have some experience with this
and I'm hoping to get the pros and the cons of having an internal overflow
and return.

Thanks in advance.