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The aquarium soil is good for plants and if you have low end plants you may not need ferts at all... that said, the soil isn't good to be used with tap water since it changes the parameters. That in itself can also cause enough stress in shrimp to cause deaths. *IF* you wanted to use ferts, you could always do 1/4 to 1/2 the recommended dose. You'll want something that provides trace and micro elements. Done right, many shrimp can thrive in a planted tank with ferts. It's doing a high tech tank with ferts and CO2 where it gets complicated and easier to kill off the shrimp. Maybe best to hold off ferts for now and see how the shrimp do.