Hello all!! I am new to this hobbie, 3 1/2 months in. I have a 125 gal. Aquarium with a bio filter, sump, and protein skimmer. Tons of live rock and sand. A friend of the family had a 250 gal tank set up for 5+ years, and then decided to devote all of her time into rrehabilitate exotic birds that have been abused. She has a big heart. She sold all of her fish and I took all of her sand and live rock. My question is, even though this is all brand new to me the LR and substrate are still considered well established, correct? It would be like moving their house, not starting from scratch, right? I hope im making some kind of sense!! Lol. Thanks guys! ;0)