No substrate just glass

[chopper]

I have always kept my axolotls on sand substrate but a few months ago decided to try keeping them on just plain glass. I found that the axolotls toes were worn down and kept getting sores. I treated them and swapped new axolotls to the tank to ascertain whether it would happen to others in the same tanks and it did. I then put others in separate tanks with just glass bases also and the same problem occurred. I returned to using sand. I was wondering if others have had this problem also?

 

[wandering]

Mine have only ever been on glass. No sores. Perfectly healthy.

Sent from my Nexus 7 using Tapatalk 2

 

[snuggly time]

Mine's got no substrate and he's perfectly fine. He's got plenty of other surfaces to explore such as bog wood, rocks, plants and ornamental bridges but he seems perfectly healthy.