Re: Aquarium Sand/ Goldfish you havee to have a little gravel in there- at least 1/4 inch. if not then there is no where for the nitrifying bacteria to grow and you have no biofilter. you can get a snail for the uneaten food. my betta lived a LONG time on that system. make sure it is a bisexual snail instead of an asexual snail if you do decide to do with that.
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