I am a newcomer with an eclipse 30 gallon. My cycle started yesterday and i am looking into getting some LR and LS. I live on the ocean and was wondering if coral/rock and sand from the ocean would be harmful for a new tank. I have 3 damsels but i am gona take them back tommarrow. what about live animals from the sea? I have a salt tester but what other testers do i need, amonia? nitrate?