First, in order for the Cheato to be of any help, its gotta be comprable in size to your tank, or its not going to do much. If you use a small ball, it will grow, but givin the size of any givin tank how much will it help that tank. The above pic with that small amount I would say is good for a 10g tank sump. Not saying its a bad thing, because over time the cheato will finally be big enough to actually polish the water for you, if, now this is seperate, your sump is big enough also, to hold enough Cheato to polish the water. Now, if used in conjunction with a ATS, now we are in business. That together would polish any system really well.