Hello everyone. I'm looking to change my substrate and decor. Currently I'm using glofish black gravel. But it chips and discolors and I think it might be raising my ph. Not to mention the food falls in between the gravel and my fish cant get to it. I also have a painted cave, ship wreck and volcano. Looking to go more natural. I will be using caribsea tihitian moon black sand and more natural looking rock caves. My question is how can I switch the substrate and decor without disturbing my good bacteria and causing a new cycle to start. Thanks.