How Much Does 450 Litres Wieght

50kg of sand
100kg of ocean rock
450kg of water
pluse what ever the tank is...

around 720kg i would say all in
 
sure enough it is..filled up last night and has not move a mm..still level around
 
50kg of sand
100kg of ocean rock
450kg of water
pluse what ever the tank is...

around 720kg i would say all in

Unfortunately it doesn't work like that,

Your rock/substrate takes up space which the water can't and therefore you don't add it like that. Though the substrate + rock is actually much denser.
 
I have my tank on my kitchen worktop.... Its around 350kg. Im just waiting to come home from work to a very wet carpet!
 

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