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Since I'm Icelandic too and done the work on the sand a couple of times I've got an advice for you.
It looks like you are cleaning the sand in an inefficient way and there is bound to be loads of sediments when the water gets in and the tank cloudy for a few days. Still it will linger for a long time, set in the sand and get loose again when it's moved around or cloudy the tank when blown off rocks.
I predict a few hundred litres of water will be spent by the overflowing skimmer for the first days, but it will only be enaugh to get some of it out.
This sand has been dry-shifted to get the most coarse parts out of it. There is a lot of dust in this sand and it needs to be departed from it before it gets mixed with the saltwater.
There has to be a clever way to do this with efficiency for such a large amount, but I used a mesh filter for my 100kg, huge amounts of water and it took half a day to shift all of it out. It's boring, but it has to be done properly.
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