sump size

90g with a 60g sump/fuge= 105 actuall gallons. Look at the dimensions of the tank, most are not full to the top. Measure actual water heights. There is a calculator that will calculate actuall water by dimensions and rock and sand amounts.

 

Okay, I'll try to find that calculator. That would be really helpful. Thank you!

 

If you decide to find volume by dimensions, the equasion is L"xW"xH"x.0043. That will give you the gallons before taking into account sand, LR, and any other solid masses in the tank which displace seawater. Make sure to use the dimensions of the water only, do not include thickness of the glass.

 

This is the one I used.

Aquarium System Volume Calculator

 

Doing that with the average dimensions of a 30 gallon sump my result was 116 gallons net. That's good!!

 

Okay, before deducting for sand, rocks, etc. that gives me about 124 gallons of net water volume.