so, i just filled my 55g with about 70lbs of white play sand....how long does it take to settle? it has been about two hours now and doesnt seem to be settling at all....


What kind of filter is recommended for sand substrate?
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Hello; I no longer use sand due to the cloudiness from fine particles that are too easy to stir up and which get into the filters moving parts and can wear them out. Fine substrates also are known to trap toxic gases in pockets that can be harmful to the fish.
If you want to use sand, one way to help with these issues is to initially dry sift the sand thru a screen of some sort. This way the very fine dust can be discarded. After that the remaining sand needs to be thoroughly rinsed as with most substrates, but will take less effort with the dust gone.
This dry sifting can also allow you to wind up with more coarse particles depending on the screen size used. This can allow for the use of sand and much reduce the chance of toxic gas pockets and also the fine stuff being stirred up. The coarser sand particles do not seem to pack so much and should be better for live plants as well.