I have the black nerites. Totally recommend them. They're big, and stunning
I've never seen black nerites, could those be black mystery snails?

I think the spotted are called tiger nerites.
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A random question. Can I use any sand in my tank? I want to start re setting up my tank but haven't been to the petshop or fish shop. I have some substrate but not enough for what I want and I'm considering using it on the top of sand. I know I already have some spare coarse (if I'm remembering correctly) sand from my quail's aviary somewhere.
 
A random question. Can I use any sand in my tank? I want to start re setting up my tank but haven't been to the petshop or fish shop. I have some substrate but not enough for what I want and I'm considering using it on the top of sand. I know I already have some spare coarse (if I'm remembering correctly) sand from my quail's aviary somewhere.
Mixing sand and substrate (gravel) makes a mess.
 

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