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How do I calculate the amount of Brackish Salts I need for a 30 litre tank please?

Here in the U.S. that equals about 8 gallons. It's (4) tablespoons per 1 gallon of freshwater to make 1 gallon of brackish water with a salinity around 1.010 or so. So for (8) gallons it's 2 cups or 16ozs. Since you have a big tank you can always use a salinity meter. This one runs about $8 US.

Thank you, exactly the information I was looking for, I appreciate your help xx

I always use this calculator and shoot for 15 PPT.

https://www.hamzasreef.com/Contents/Cal ... ulator.php

If you have a tank with no shrimp or snails etc you can just keep adding salt and measuring the salinity as you go.