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Ya I just added a goldfish in my new tank and he was little shy at first but he's really getting active.
Oh and I've heard of people making bubbler decorations with glass drink bottles. You rinse them out and attach an airline to the bottom and it bubbles out the top. It always sounded like a cool idea to me.
If by rocks you mean gravel then it doesn't matter.
I usually turn my aquarium lights on when I get up and turn them off when I go to bed. But you can do whatever suits you. I wouldn't leave them on too long though or you can get algae.