| | relocating tank; worried about substrate
I have had my tank set up for about two years now. When I set it up I didn't do so properly unfortunatley. I have about 1.5-2 inches of onyx sand with nothing under it to keep anerobic areas from forming. I have never had problems with fish gasping, and have plants throughout most of the substrate not all of it.
I am worried about moving the tank because to move it I will have to remove all substrate and then put all the substrate back and reinstall the substrate once the tank has been moved, I am afraid that if there are any anerobic areas the fish will be effected in a very bad way. I plan to remove the fish from the tank before takeing the substrate out of course. Do I have a real concern here or since the fish will not be in the tank while I am gathering the substrate they wont be harmed? I am also worried about setting the tank back up with the substrate if the fish could be harmed once the water and substrate are back in the tank.