Hi I'm looking to an aquascape on my 50 gallon goldfish aquarium. I plan on collecting rocks but how do I know they won't alter the perimeters of my water? I watched a video and know that muriatic acid works but I went to go buy some and was warned that it is extremely dangerous and my parents would not let me get it. I heard vinegar works but I know it's not that dependable. Also, I saw someone using a 10 to one solution in bleach but I do not know about that because i do not want to harm my goldfish in any way. I would buy rocks at a pet store but they don't have the weathered rocks I'm looking for and they are expensive. Any help with finding aquarium safe rocks? Has anyone done this? Thanks.