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I have a 75 gal. reef tank with a 2 inch sand bed. Decided to put a hang on overflow to sump. Right now have a Penguin 440 hang on filter, Magnum 330 Canaster filter, and a Protein Skimmer. I am going to take it all of and run a 30 gal. sump with the overflow. I can't decide on what pump and overflow to go with. I am looking at the Mag 5 or Mag 7. With the height to the tank, the Mag 5 is going to do around 300 gph. The Mag 7 is going to do around 500 gph. The overflow is going to be a CPR aquatic CS90 or CS100. Now the CS90 does around 600gph and the CS100 800gph. The price difference is not that much, $10 for the pump, and $5 for the overflow. I am really stuck and have been trying to get this worked out in my head for weeks. Any input on this would be a great help. Tank does run cold and even thought about doing a custom sump that way I can get the biggest benefit. Thanks in advance.
 

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I just did this three weeks ago with my 75 gallon and a 30 gallon aqaurium I put accrylic baffles in (DIY SUMP)....I purchased this overflow box....It works great....
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=280327259145

My return is a Maxi Jet 300 utility pump...750gph...500gph at 4'......it really matched will with the over flow box I bought....Prices was not too bad...
http://cgi.ebay.com/Marineland-Maxi-Jet-3000-Utility-Pump-Submersible-7054_W0QQitemZ280320497897QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item280320497897&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50
 

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I would go with the MAG 7 and the CS100.

Not sure what you mean by the tank runs cold?
turn up your heater.

U can fit 2 20g rubbermaid under a 75. I would overflow into one and add a insump skimmer then flow into the 2nd rubbermaid (using a 1.5" bulkhead 2 for failsafe) the put your return in the 2nd rubbermaid...
 

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Aquatic Philosopher
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I have a drilled 65 with a mag3 pumping just under a 5 foot head. I actually downgraded from a 600gph pump and found my sump/skimmer capability increased. Depending on your skimmer, I normally say match the pump and skimmer flow rate. If you are pumping more than your skimmer can handle, then it is not being as efficient. If it is less, you are making sure the water is skimmed before you return it. If you are running a fuge, slower flow is also a bit better (esp since it is a 30g sump). The 24/7 nature of the return also means that small pumps save electricity and $. I don't think you need more than 10X flow compared to sump capacity. Then again, if you are planning for your return to provide the majority of display tank water flow, then bigger may be better.
 

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Carpe Noctem
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Any way to talk you out of both the mag pump and the CPR overflow?

I would go with a quality U-tube overflow such as a lifereef and a eheim pump;) Better reliability and less chance of flooding your floor...
 

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Any way to talk you out of both the mag pump and the CPR overflow?

I would go with a quality U-tube overflow such as a lifereef and a eheim pump;) Better reliability and less chance of flooding your floor...
Or you could have the tank drilled, but if that ain't happening I would shy away from the CPR overflow, I don't trust one that needs a $10 powerhead to suck start it :eek:
 
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