marine set up

beaslbob

For a quick and dirty computation keep in mind that a gallon of water is 7.5 cubic feet so calculate the cubic feet take 3 fourths of it then add a 0.
In your case 3 fourths of 4 is 3 times 2 is 6 times 2 is 12 adding a 0 is 120 gallons
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Reefing Madness

Try this computation out. You don't need to be a professor to do it lik Bob here.
your tank is 119.7g
Calculating Aquarium Volume - The First Tank Guide - How Can I Figure Out How Much Water My Fish Tank Holds?

Tangs are ment for long tanks, or common tanks. So when you see that they are better suited for a 125g tank, they are refering to a 72"x18"x21" tank. The back and forth swim room is what they are looking for in the tank.

Joe1985

technical much bob haha yeah i get it easy to do n great to look back on so much work researching all this stuff but worth it i guess right

beaslbob

Will if you wanna get really really technical and have a calculator handy take the cubic inches and divide by 231. The 3/4 of cubic feet and an added 0 I think most people could do in their head in a pinch.