Roxane1232
Aquarium Advice Activist
I am wanting to change my substrate in my 20 gallon tank from gravel to black sand. My tank has been set up and cycled since the first of May. I also have otos, which I am concerned about stressing out during this process, which I have had for almost a month now. Any suggestions on how to do this without stressing out my fish too much or starting a mini cycle? I also plan on setting up a new 37 gallon tank in about 2 to 3 weeks, so should I wait until I have that tank cycled and move the fish to that tank while I switch the substrate.