Crystals in tank?

Day

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I bought a whole new tank set up and it kind of looks like this, but what I’m wondering is if it’s safe to put quartz in a fish tank for my Axolotl’s like in this photo.
6F0170DC-C44F-4E4D-8D14-FDD29A4094D7.png

I just bought a bulk of them and was wondering if these were ok. They’re 100% natural.
1032F8E2-1ECA-4655-87DF-16716CC78F55.jpeg
 

minorhero

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Quartz is inert. Most sand is made of quartz. But they will collect algae and that algae will be extra obvious on the crystals surface. /Shrug
 

Murk

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Also, don't put anything in the tank that's smaller than the axolotl's head, or it will get eaten. Stick to objects twice the size of their head, just to be sure.
 

Day

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Quartz is inert. Most sand is made of quartz. But they will collect algae and that algae will be extra obvious on the crystals surface. /Shrug
Can I still put it in the tank anyway?
 

Day

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Also, don't put anything in the tank that's smaller than the axolotl's head, or it will get eaten. Stick to objects twice the size of their head, just to be sure.
I know lol, Ive had my axolotls for 6 years. I was searching for 3 hours, I kid you not, for crystals that were 6 inches or more. I just wanted to make sure that putting crystals in there was safe
 

JaceW/Lifer-Log

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I see no problem with quartz, like said in another post most sand is made of quartz.
 
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