Suitability of floor for fish tank weight

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We're looking to install a fish tank in our kitchen and I was looking for some advice to see the suitability of the floor to take the weight. The details of the tank as follows:

5 foot Aquarium Tank – Total weight with water approx. 750kg.
Footprint 1.5m x 0.5m
Floor Joists are engineered timber 'I' beams measuring 245mm x 45mm (see attached photos) at 600mm centres

The tank will be located next to wall which is an external wall to the house and will be perpendicular to the floor joists, hence load will be distributed across three joists.

Does this sound ok or is it something I should be concerned about?
 

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The design imposed load of the floor is likely to be 1.5 kPa or 150 kg/m2. Your load is 1000 kg/m2 so greater than typical plantroom loading. The floor may take it but you'd definitely be locally overloading it, if not globally overloading it.
 
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Roughly a litre of water is 1kg so tank capacity of water plus dry tank weight and sand gravel etc.
 
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Hi Again. In the first picture showing under the floor we see the i beams then a space below. At the bottom is that a ceiling or concrete base. If a concrete base you can breeze block up under the joists
 
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so my new fish tank is arriving soon and for peace of mind i plan to add some additional supports between the floor joists and the concrete solum base.

i'm looking to use underpinning jacks - anyone has any experience of using these? are they as straightforward as tightening them into position and that's it?
 

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