Hi I have recently started a 20 litre planted tank. I used tropica plant soil dust as my substrate, so that i could give the plants a good start. The problem is that the soil has made the water much softer than my tap water. I dont have ro water and i was hoping to keep cherry shrimp eventually in that tank, which looks unlikely now. Is there anything i can do apart from starting again from scratch with a different substrate. Any help would be gratefully accepted .