Please id the yellow things on my new rock

[Furret]

Is anyone know what is it. Algae, mushroom, spore. Bad to have or not a problem.
What to do with it, i already have bleach the rock during a month in a bucket and change the water daily . And i let them dry a couple of days and it still grow up

 

[DavidAl]

What animals do you have in this tank?

If you bleached the rock (and I'm assuming you scrubbed it) and it is still growing, then it must be coming from inside the tank and not something that hitchhiked on it.

David

 

[Furret]

Its a new tank, just put the rock for the first time 3 days ago when i have vuy them

 

[DavidAl]

Do you have anything that is alive in this tank?

David

 

[Furret]

Oops i have press send. But yea when i've buy them i've put the rocks in clean new bucket and wash then with water scrub them and then realise that it was like this so i vekeep cleaning it with a bit of bleach an scrubing and let them dry for a week bt it coming back . Ps i ve no fish yet

 

[DavidAl]

Is there any way you could boil the rocks? After that, take the rocks to a car wash and pressure wash the heck out of them!

David