Gravel

until the water runs clear!!! remember to be careful what bottom feeders you add as their barbels can be damaged by sharp gravel. some species prefer sand.

L :good:
 
washing gravel how long AND PUT IN THE TANK

Whether you have sand or gravel, it makes no difference. Keep rinsing small batches in a bucket, until no further dust or scum comes off. It's a long process.
 

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