Ok, I plan to add ferts when my lights come on, this tank is decently planted, but what are thoughts about the Gh, Kh and pH? I'm from the land of Twin Cities Guppies, and our water is rock hard, but I'm trying to figure out where my buffer and pH are going? Can all considerations be fixed with some crushed coral? (20g long, shrimp tank, plenty of algae, a handful of anacharis, freshly planted S. repens with root tabs, some Java fern, 1 oto)