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i have sand sifting starfish, snails, hermit. but i find they only keep an estetic look to the sand (surface clean), they will not keep the sand from accumulating detritus, nothing beats a turkey baster or a periodic syphonning.
More info about your tank (size, livestock, sandbed type/depth) would help.
Nassarius snails, sea stars, conchs, hermits all do a good at keeping sand clean.
I have a 36 gallon tank, I had a diamond watch goby which kept a large section of my sand clean but it died around 2 weeks ago, wanted to go with something new.
diamond goby's are sifting machines
Diamond goby's are the best but they could arrange your sand bed in a way you might not like. If they find a spot near a coral they like, you might have to move the coral because they will constantly cover it with substrate.


