10gal_nano
Aquarium Advice Addict
You put your rock in 6-7 days ago according to this thread. Your tank is still cycling and ammonia and nitrite are just as toxic to coral as they are fish. Take the coral back to your friend until your cycle is complete. Nothing good happens fast in this hobby
I had my water checked. Also I put rocks and sand and water in 2 weeks ago but didn't start this thread until last week