Crystals in tank?

[Day]

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.

I just bought a bulk of them and was wondering if these were ok. They’re 100% natural.

 

[minorhero]

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]

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]

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]

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]

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