Re: new fish
you may find the cichlids to be incompatible with the live bearers due to aggression. also cichlids are diggers, so if your rocks are just sitting on top of the sand... when the fish dig under them they will likely get crushed by a falling rocks.
in general it is best to stick with one type of fish (such as live bearers or tetras) untill you gain more experience with identifying fish and judging compatibility. if your like most of us you'll find that one tank is seldom enough for all the fish you want to keep and you will quickly fill the house with tanks and fish related gear.
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