Best Sand for Cory Cats?

Coradee

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Pool filter sand is good for corys however I wouldn't go with white as in my experience it tends to go greeny brown after a while & depending what corys you have they can look washed out on too light a substrate.
The opposite happens when some species of corys are kept on black substrate, they tend to go very dark to try & blend in
 

JimTheFishGuy

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Play sand isn't always better (isn't it easier to form the anaerobic pockets in play sand?), and it's light colored - same as the PFS. I have Black Diamond Blasting Sand too, and I love it - dark black and perfect for cories.
PFS and blasting sand are actually measured, all of the grains are around the same size and water flows easily through them (exactly the reason why PFS works as a filter)

Play sand is just randomly-sized, so you could end up with tiny grains filling the spaces between larger grains, which reduces internal water flow and allows such pockets to form. Even if you do use play sand, frequently raking it with a stick helps distribute oxygen within the substrate and reduces the chance of pockets forming.

Also, I noticed you were talking about cories... Isn't this supposed to be a saltwater area? (This question is in the wrong place.)
 

TexasDomer

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PFS and blasting sand are actually measured, all of the grains are around the same size and water flows easily through them (exactly the reason why PFS works as a filter)

Play sand is just randomly-sized, so you could end up with tiny grains filling the spaces between larger grains, which reduces internal water flow and allows such pockets to form. Even if you do use play sand, frequently raking it with a stick helps distribute oxygen within the substrate and reduces the chance of pockets forming.

Also, I noticed you were talking about cories... Isn't this supposed to be a saltwater area? (This question is in the wrong place.)
It's an old thread, and yes, it appears to be misplaced.

And agreed, PFS and BDBS aren't as likely to create the anaerobic air pockets. I meant only that that PFS is light colored like play sand.
 

Greenplant

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Play sand isn't always better (isn't it easier to form the anaerobic pockets in play sand?), and it's light colored - same as the PFS. I have Black Diamond Blasting Sand too, and I love it - dark black and perfect for cories.
Is 20/40 medium grade the right grain size.
 
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