Check this sight and maybe give this a try for your top current.  I have been using this for about 3 months with no problems.  I did modified this by just screwing it onto a mag 3 and standing it up right behind my rock work.  It rotates at 180 degrees.  As soon as home depot puts them back out for the spring I plan on adding another.
 
----- Original Message -----
Sent: Monday, January 08, 2001 2:30 PM
Subject: Re: 500 gallon tank

After Ron spending over an hour with me on the phone and after speaking to
the owner of the tank this morning we have decided to do a few things.  He
has what looks like about 500 to 600 lbs of live rock in the tank.  Most of
it is void of life and covered with a brownish algae.  The bottom of the tank
has a bunch of green slimy looking stuff on it too.  He is not very motivated
to replace all the rock at Ron's recommendation because of the cost factor.  
Going to eventually drain the tank, take out all rock and fish that are still
living, scrub the rock as some of you recommended, and probably add some
fresh live rock to the tank.  There are traces of cor. algae on some of the
rocks so maybe it will come back pretty quick.  Going to build a canopy
hinged to the wall and put 8 actinic 6 foot vhos, 2 daylight vhos, and 2 40
watt ac! tinics, and two 40 watt ultralumes on the back.  Going to use dual
overflows from Ron running to a 100 gallon sump.  The return to the tank will
be 1 inch plumbed with two iwaki 70's plumbed to a spraybar running across
the back of the tank at the bottom blowing through the reef.  Going to use
one iwaki 40 rlxt split on either end of the tank for top current.  Ron
recommended two of his big skimmers with deluxe mag 350's and the dw962 air
pump which we are going to use.  He has some big oceanview canister filters
that I was wondering if I could use in place of the mag. 350's but not sure
if they will do the same thing.  Looking at a spectrapure ultrapure 70 gallon
a day with a 100 gallon reservoir all set up to come on and off automatically
with float switch in sump for top off.   Going to use about 50 or so lbs. of
Fiji live sand for the substrate.  Going to start buliding the canopy this!
week.   Cleaning out the tank is going to be a big chore.  Any suggestions as
to the progression of adding equipment, cleaning, etc. would be greatly
appreciated.  He really doesn't want to buy all this stuff at once. I would
love to be able to start over with new rock but he was pretty adamant about
that not happening. Also, going to add two 40 watt uvs at some point down the
road.  Sounds like a pretty good setup to me and I would welcome any comments
from ya'll (as we say it down here).  Sorry for the long post.  Going to take
some pics as I go so you can see my progress.  
Glen

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