Since I don't know what size, I'll give ya an example of what I do to polish my water.
I have an AP12 reef tank. On every water change, I turkey baste the rocks/corals and run my Duetto 100 submersible power filter with only cotton. It takes about 1/2 hour before it becomes clogged with detrius matter.
Maybe you could implement such a routine. Diatom filters may work well, but they can be a hastle to operate.
You really want to implement something that you could run for a short period of time and easy to set-up without tubing and valves.
In my opinion, cotton is one of the best inexpensive polishers on the market.
I hope I helped you out a little. Hope you find what you need to polish your tank.
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