Corner-Flo Pre-Drilled Glass Aquariums

We offer corner-flo and pre-drilled aquariums in a variety of sizes.
  • We offer corner-flo and pre-drilled aquariums in a variety of sizes.
  • 200 Gallon Corner-Flo Pre-Drilled Glass Aquarium
  • 250 Gallon Corner-Flo Pre-Drilled Glass Aquarium
  • 300 Gallon Corner-Flo Pre-Drilled Glass Aquarium
  • With one of our deep dimension Corner-Flo glass aquariums and tanks, you'll enjoy great circulation.
Product No. NV97003
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Corner-FloTM Pre-Drilled Aquariums combine Marineland aquariums with the latest advanced-design water-flow technology.  Ideal for freshwater and saltwater applications. 

  • Plumbing kit included with each aquarium 
  • Distortion-free glass  
  • Silicone sealed to prevent capillary action and leakage 
  • Lifetime limited warranty on all Corner-Flo glass aquariums 

Engineered to deliver perfect circulation and maximize water flow to the main filter system, the Corner-Flo eliminates “dead zones,” while minimizing flow noise. Water is drawn from the surface and bottom levels at an unprecedented rate of up to 700 GPH, providing the ultimate in circulation efficiency, and fishkeeping success.

A complete plumbing kit is included with each pre-drilled Corner-Flo aquarium and is designed for efficient water collection, filtration, and distribution in this easy-to-install assembly. Plumbing kit contains: All necessary bulk-head fittings, drain, return pipes, and dual Loc-Line® outlet nozzles. 

Double Corner-Flo aquariums include two plumbing kits, one for each Corner-Flo unit.  

Additional plumbing accessories may be needed for your external filtration unit. See manufacturer’s directions for further details.  

  • Matching glass canopies available
  • Many Marineland lighting options available  
  • Most rectangular aquarium sizes 75 gallons and up 
  • Cube aquariums available with Corner-Flo 
  • Curved front aquariums available with Corner-Flo 
  • Deep Dimension Aquariums available with Corner-Flo 


Stands are available for Corner-Flo Aquariums in the Majesty, Newport, Heartland, and Monterey designs.  More about these stands can be found on the links to the right.

Corner-Flo Pre-Drilled Glass Aquariums is rated 3.2 out of 5 by 6.
Rated 3 out of 5 by from Bad silicone job I purchased a 220 gallon with built in over flows. Set the tank up for freshwater Discus Fish. This tank is a brute very, very, very heavy once you set it up you definitely don't want to handle it again. After set up and filled with water I noticed a small bubble in the black silicone on the front left seam about in the middle of this seam. I didn't think it was a serious issue, all of the silicone on that seam looked good and the bubble was very small, all other seams were good. due to the weight of this tank, all plumbing and set up complete I really didn't want to move this beast. Two years into this setup my wife called me and said the aquarium was leaking at the seam. By the time I got home there was stream of water shooting out from the seam about the size of a pencil lead. Thank goodness she was home and put a bucket under the stream of water. I went into panic mode, got out my 20 prized Discus and a few other fish put them into large coolers and completely drained the aquarium and took off to my local aquarium store. By the time I had drained the aquarium the seam had opened up abut three inches. I have not contacted Mairneland yet but I doubt I will ever set up another large aquarium again regardless of the outcome. Thankfully I have a neighbor who is in the racing business and he had a crew of strong young men who got the aquarium out of my home for me. I am 68 years old, and there was no way I was going to move this thing with some serious help. I have had aquariums since I was 6 or 8 years old and was my first and only tank failure. MY ADVICE IF YOU ARE GETTING A LATGE AQUARIUM AND THE SEAMS ARE NOT PERFECT IN EVERY WAY DO NOT ACCEPT IT!!!!!!!!!!
Date published: 2017-02-24
Rated 5 out of 5 by from Great customer service I bought a 150 gallon with overflows. The store new everything about the tank so that was helpful. I had a small problem with the tank and wrote a review about it. Marine land contacted me and offered to,,, then did take care of my problem. I've since moved to a smaller home but have 3 marine land tanks. Two 75 gallons and a 30 I made into a dump. I will only buy marine land tanks. Except the horse trough that's part of my sump but even then for a few extra dollars I could've bought another 75 gallon that would take less space in my closet.
Date published: 2016-09-17
Rated 1 out of 5 by from Bad product poor construction Do not buy ....I have a 75 gallon reef ready tank that hasn't even been running for 2 yrs and now the seals on the inside are failing.lots of time and money is in this tank and now I have to fihire out what to do because there tank is failinh
Date published: 2016-07-10
Rated 1 out of 5 by from Do not buy !! Asking to get a cloged drain I bought the 150 gallon tank and was told it has a one in half inch drain but really it is a one inch drain !!! Right before the bulk head it has a reducer on it that goes to one inch , Therefor you are not getting enough gph if you want a nice reef tank and asking for something that can fit down the drain to get clouged when it reduces !!! - like snails or a fish that's dead or alive that makes its way over yes unlikely but why take the chance and why do they claim it has a 1 in a half inch drain when they don't
Date published: 2015-11-05
Rated 4 out of 5 by from Great tank But they stop making the corner flo on the back of the tank which is a problem for me so I may have to go with AQueno tank
Date published: 2015-07-03
Rated 5 out of 5 by from Awesome tank at an awesome price! I recently purchased the 125g dual corner overflow glass aquarium with black silicone. While I've not installed the tank yet (building a stand), I have to say that the quality of this tank is great. The price was awesome as well especially for a dual corner overflow. The packaging was very good as well. A big, big bonus are the included Durso overflows! Well done Marineland!
Date published: 2015-04-07
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hi - can you send me the drilled hole sizes for the drain and return lines on the corner overflow tanks please>

Asked by: lancer
Hi lancer, The bulkheads are 1" and the holes are 1-1/4". BREX
Answered by: BREX
Date published: 2017-05-23

Is your 40 (45?) gallon cube aquarium available with a corner-flo option? My local fish store has the corner-flo in the 60 gallon but I would rather go with the 40...? Could the 40 gallon cube be drilled after purchase?

Asked by: trhuke
Sorry, but no, we do not make any corner flows that small. There are no tempered panels in the 45 cube, but any drilling voids all warranty on the tank. BREX
Answered by: BREX
Date published: 2017-05-01

i sent in some pics today of bubbles in front glass on a 220 corner overflow tank. how long dose it take to hear back from someone.

Asked by: ike71
Hello ike71, Our response time to emails is typically one business day. I checked and did not see an email from your address, so either we have not received it or it has been answered. Please be sure to check your spam box. BREX
Answered by: BREX
Date published: 2017-04-27

what are the stipulations of the lifetime warranty on the marineland aquariums. specifically the 265 reef ready?

Asked by: Chris D
The tank must not be altered or damaged in any way, and must be on a manufactured aquarium stand or a custom stand built by a recognized pet store. We require the receipt, built by sticker pictures of any area that is damaged due to poor materials or workmanship, etc. BREX
Answered by: BREX
Date published: 2017-03-22

 I have a 220 gallon with dual corner  flows. How do I get in between the sleeves to clean? There is a lot of scum buildup in there and it appears that both sleeves are siliconed. 

Asked by: Greg discus
If you are referring to the panels, the middle section of the panels is removable, it just slides out and in. The side pieces are not removable though. By removing the middle section, you can reach in behind to clean. BREX
Answered by: BREX
Date published: 2017-03-31

220 gallon dual overflow tank. I will be replacing the plumbing and want to replace the bulkhead fittings. What diameter are they? I am thinking 3/4 and 1 inch.

Asked by: Barrie
Barrie, Thank you for your inquiry and we are sorry to hear this. However, you are unfortunately going to have trouble finding the correct bulkhead fittings. Therefore, we can help you with this. We will be emailing you directly for more information about obtaining the proper fittings. Christina
Answered by: MINI
Date published: 2017-02-27

Can I drill a extra hole in each of my corner overflows so I can make a full siphon with a back up on my 125 glass aquarium

Asked by: Trnfan1
No, any drilling will void the warranty. BREX
Answered by: BREX
Date published: 2017-02-22

Are the glass lids for the 120 XH 30" long? Is there anyway to view the warranty terms and information? Can I use a suitably constructed custom stand without voiding the warranty?

Asked by: Lansdowb
No, they will be less than 30" long as they rest inside the frame of the tank. We do not warranty glass canopies, other than at the time of purchase. Custom stands limit the warranty to one year on the tank only, regardless of how built. We do review each case separately, however. BREX
Answered by: BREX
Date published: 2017-02-14
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