Here's a formula to use to find weight of your water.
LxWxD (in inches) divided by 231x 8.3
example a tank 4'x 1-1/2x 1-1/2. 48 x 18x 18=15552 divide by 231 = 67.32 gallons multiply by 8.3 LBS/GAL=558.75
Salt water adds about 1/4 LB/GAL so .25x 67.32=16.83
Add together 16.83 +558.75=575.58 total lbs plus the weight of stand and equipment, rock ect...
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