Illuminous green on new rock

[begginersluck]

Rock was dried and un cured and has been in the system for 5 weeks now. I've never cured dry rock so just wondering what this green is on there.

 

[donker]

Some sort of algae; I know I had some grow on a similar piece of dry rock I put in my tank many years ago when it was first getting started. It faded away gradually as other life started to take hold.

 

[begginersluck]

I thought as much. It's really cool if you look closely.

 

[jose7878]

It could also be green Coraline. Since Coraline comes in several different colors. Take the rock out see if you can scrape off. If it doesn't it Coraline. Which means your tank is starting to mature.

 

[begginersluck]

Then it's Coraline lol. This is a good sign. Nitrites are starting to drop also so won't be long before I can put a fish in there.