Changing decorations..?

[Roxy0416]

Will changing the decorations in my established tank harm the environment in there?

I've had my 75 gallon up for about a year, but my blood parrot has gotten so huge that I feel bad he can't swim through anything. I'd like to take out the decor I bought from Petsmart forever ago and put in a bunch of big cichlid rocks.

Will that mess up my levels?

 

[calfishguy]

As most of the beneficial bacteria is in your filter media it should be fine. Have fun redecorating.

 

[NYgiantsRP]

I move stuff around in my tank almost weekly. Nothing wrong with it.