View Full Version : 75, 90, or 120?

11/03/2013, 07:32 PM
I am torn between tank sizes. I need to upgrade as things are getting a bit crowded with corals and my white tail tang in QT. Now, I always wanted a 5ft 120 but I am unsure of how much of a difference there is with maintenance in comparison to a 75 or 90. If I were to go with the 120, it would take a bit longer to upgrade as I would have to buy additional lighting and more cost of the tank/stand. now with the 75 or 90, does the extra 3" in height really matter? I can't go with a 4ft 120 because it is too wide for the spot it is going. Thanks in advance for your responses.

11/03/2013, 07:56 PM
They say size doesn't matter but we know that's not what they truly feel like :) I say 120. The longer it takes for you to get to the point you want to be at, the more time you will be enjoying working on your tank.

11/03/2013, 08:21 PM
Maintenance costs should be pretty close to one another. Main difference would be initial equipment setup.

I don't think the extra 3" will make much of a difference.

I'll say go with the tank you want, the 5ft 120. Either way all are fine choices.

11/03/2013, 08:26 PM
They say size doesn't matter but we know that's not what they truly feel like :) I say 120. The longer it takes for you to get to the point you want to be at, the more time you will be enjoying working on your tank.


11/03/2013, 08:34 PM
A 75/90 is wider than a 55, so you'd need to buy/build a new stand/canopy anyway. So I say go big or go home, and upgrade to the 5ft 120. :D They also make a 5ft 150 (taller). You could possibly re-use your 4 ft lights (don't know what kind you have) on a 5 ft tank.

11/03/2013, 09:28 PM

11/03/2013, 09:29 PM
Go with the 120G or you'll always wish you did!

11/03/2013, 09:36 PM
I had both a 75 gallon 4" tank in my office and a 125 6" tank in my home.

The 75 gallon was MUCH easier to do maintenance. Less water for changes, less glass to clean, not as hard to reach things and less expensive to equip but..........

The 125 could hold more stuff! Bigger fish! Now, isn't that what we are all after anyway?

11/03/2013, 09:38 PM
I've had a 90 and a 120. Cost to run/maintain are basically the same and parts needs are very similar. Go with the 120 IMO.

11/03/2013, 10:14 PM
I would go with a 120, other than buying more lighting and stuff the over all maintenance is the same ( just a little bit more water out/in) Bigger is better is how i look at it.

11/03/2013, 10:33 PM
Ok I think I'm going to go with the 120. I am going to buy the tank and store it until I can get the stand and piece it all together...I hate seeing large quantities of money leave my bank account at once lol. So I guess waiting longer will be worth it. I have a reef breeders 48" photon over my 55. I might add a 16 photon For the extra length unless you think it's unnecessary. What size sump would you recommend for a 120? I was thinking a 30g.

11/03/2013, 10:40 PM
I have a 60 Gal sump on my 120 currently you can see my setup here


i have a pic of my sump setup in the photo link

11/12/2013, 08:09 AM
150 4 foot Tall version.

Of course I have the 37 tall right now LOL

11/12/2013, 08:24 AM
120 4x2x2

11/12/2013, 09:20 AM

11/12/2013, 06:51 PM
120 4x2x2

+1, I was going to suggest the same thing

11/12/2013, 07:38 PM
I went from a 90 to a 150 which is a 120 footprint but taller. It's a great size. But The 150 is 30" tall and hard to maintain to reaching the bottom. The 120 won't have that issue.

Go with the 120. The 4' wide 2' depth and 2' deep allows a good placement of rocks. The 18" from front to back in the 90 gallon makes it harder to set up rocks. Plus bigger is better...more fish...more coral.

More important than the 4'x2'x2' tank is the stand. Get one that is tall enough for equipment and open enough to get in there.

11/12/2013, 07:50 PM
if you are doing coral and fish then typically you want a sump at least 1/3 the size of your DT. I have a 120 DT with a 55 sump. and I now wish my sump was 90. this would give me more room for reactors, fuge, skimmer, and all the other good things in the darkness of your stand. More water is better.