Iredalei shell colour...

[christyjade]

Hi, When bathing my snailies today I was cleaning my Iredaleis shell and it seems to have gone much darker, and is no where near as yellow as it was when i first got him. Is this due to the substrate or diet? He is on soil and burries himself alor. He has a varied diet of salad, veg and fruit. Any suggestions?

Thanks

Christy