just wonderinif you are changing gravel in your tank do you need to put fish in a separate tank and do the cyling process all over again. or do u steep it for a few days and continue changing the water til it it clean.
A nice way to get the gravel out is to just siphon it out-obviously you need a tube that is thick enough to get the old gravel out. If you can keep the fish in during the change it is easier for all concerned.