Hello Guys and Gals I have a 190 Ltr Planted Aquarium PH: 6.6 Ammonia: 0 Nitrite: 0 Nitrate 10 ppm Phosphate: 0.25 ppm Substrate: ADA Power Sand (with some Penac P added) and ADA Amazonia Aqua Soil on top I only do my water changes with RO Water from my local pet shop...