Prime conditions for the water to penetrate.
Water wicking up siding.
Water that blows into cracks between siding pieces can be absorbed into structural wood and insulation where it may stay and grow mold or rot wood siding from behind.
If you are wicking water into soil beds it must not be allowed to return into your fish tank.
The extra thickness of the vinyl.
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A good demonstration of this is the old junior high school fish terrarium combo.
Since water runs downward unless it s being driven by strong winds the standard method for creating water resistant vinyl cladding is to start at the bottom and work up.
Wood s end grain can wick water the same way up down or sideways.
Rain water striking the side of the house will run down the siding to the edge.
Turbidity will result and you will be killing a lot of fish.
Behind that should be a drainage plane such as housewrap that will keep moving water away if it gets behind the siding.
If everything is dry above it i wouldn t think that.
Could it be that the water is wicking up from the slab.
Seat of the pants guess is that the paver job or some other landscaping work raised the grade so it was above the bottom of the osb sheeting and the siding.
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Possibly water is running off the roof hitting the ground and then is wicked up.
You may have to look at regrading so get the grade at the proper level.
Caulking the bottom.
In every case the fish environment must be separated from the terrarium environment.
Protecting a house against water intrusion starts with creating a barrier such as siding that moves water away from the structure.
Rainwater leaking from a gutter ends up behind siding and causes a wall to rot.