Iron Deposits In Slate (Rust)

[ZoddyZod]

I recently made a slate cave and noticed that where I split the slate it has turned a brownish colour after being placed in the tank.

I read somehwere on here that slate can contain iron deposits - if that is the case, will the resulting rust (which I presume has caused the brown/orangey colour on the slate) cause an issue within the tank?

 

[Sammyb]

Ive had brown (rusty) slate in my tank before and it didnt do any thing and it was in for a bout a year but i also did hear it can be bad, so ill let someone else who knows a bit more about it give you a definate answer

 

[tribalbrit]

I have had a large piece of slate in my tank for many years with a vein of what looks like rust in it with no problems.

 

[ZoddyZod]

sounds promising so far!

Anyone got a definitive on this one way or the other?