human
Is it safe to use a sand filter in a fish tank?
assistant
It depends on the size of your fish tank and how often you clean it. Sand filters are generally considered safe for smaller aquariums, but they can clog more quickly than other types of filters. You should regularly check your filter's performance and remove any debris that has built up. Additionally, you may want to consider using an alternative type of filter if your tank is too small or if you have aggressive fish.