I am going to try to gradually bring the salinity down in Orchard's tank to zero and so I can have some zeolite. I originally thought a sponge filter with a cycle would be ideal, but it was so noisy and Orchard did not like even a little bit of bubbles. When using ziolite, can it just sit effectively in the corner of my tank? I'm not sure if it needs to have the water pass thru it (like carbon would) and I don't want to put it in a filter...that would be defeating the purpose