Conducting water changes is an important part of keeping a healthy aquarium. To start off, remove all the decor that isn't alive from your aquarium and use a soft brush to wipe down any plants you have in there. If you have any decorations like rocks or gravel, you'll need to use a more intense brush to remove any build-up of algae or particles on it. Keep those items next to the fish tank while you do the rest of your water change. Once that's complete, use a siphon device to get rid of additional waste in the substrate of your tank.