I see a lot of 125s but not a lot of 120s. A 125 is a 6ft tank that is 18" wide and 22" high, while a 120 is a 4ft tank that is 2ft wide and 2ft high. So why do most folks go fot the 125?

Length, most of the time for tangs. Reason i went 125 but also the tank was only $50 so why not? Wiz

To me lenth is better than width, I have 2 tangs
6 ft just looks so sweet

Ditto for length for larger swimming fish.

The plus for the 4 ft 120's is must more floor space and with being only 4 ft you could light it with much cheaper lights. I hear a of 120's run only 2 MH lights. I have 3 to cover the 6ft on my.

go with the 120 you can get some neat deep designs

More area, 9 sq feet vs 8. Plus swimming length and Wow! factor. A 6' tank looks huge.

I went with a 120. I preferred a deeper tank. A six foot tank would be nice but having a six foot tank by two feet deep would be too big for my house. So my only choices was a 4 footer, 90 or 120. Went with more depth. I guess if I was in the market for a six footer it would have to be a 180 not a 125.

I prefer deep tanks they allow for more unique aquascapes rather than the run of the mill pile o' rocks.

Everyone knows it's the width that matters, not length.







Anyhoo, if you're focused more on keeping larger fish that require more swimming room, then I'd opt to go with the 125 for the 6 feet of swimming room that it provides to fish like Tangs.
On the other hand, if you're more focused on a reef and corals, I'd opt for the 120 for the depth that affords you with more aquascaping options.

I for one would rock the 120 with a full SPS reef

hmmm, maybe a 180 would be best of both worlds at 6' x 2' x 2'

Now you're using the ol noodle.

Depth front to back gives you much greater landscaping possibilities but length is nice too. I would go with the depth and place my rock with lots of caves, shelves and arches for the fish to swim through and explore, looks much nicer than a long, narrow, tall pile of rock.

That was my rationale for getting a 5'x2.5'x2'. Can't pick a winner, so split the difference


Another reason I guess for people to choose a 6' long tank over a 4' is the cost. Because the 6' is comparatively much shallower, thinner glass can be used safely, meaning prices come down. At my local tank builder, the cost for the extra .5' is close to $250 for the same dimensions. Plus, the other aspects definitely help!

I think I might have found my tank - http://cgi.ebay.com/150-Gallon-Wide-Saltwa...34.c0.m14.l1262

178rr oceanic

Very nice and the price is good as well.

I love the look of oceanic tanks, just not crazy about their dimensions. The 178rr is too tall for my taste.

Thats a nice tank. I prefers 120's and 180's to 125's.

The width of the tank really helps with coral placement.

marineland dd tanks i love the 300. one day

There are two guys in the Cleveland salt club that have them. I have seen one in person - to me it has the perfect dimensions. But man that is a lot of work.

Driving to Michigan (ugh) tomorrow to pick up the new tank. 150 gallons, 6' long by 2' wide by 20" high. I'll start a tank thread when I start to make some progress.