how many fish am i going to be able to keep in my 72 gallon if i had round 70 lbs of live rock? and what about dragonfish? what should my salinity be at? can i measure this with a gravity hydrometer? if i get LR from an established aquarium, and throw it in there quick will there be die off? is there any point in buying live sand out of a bag? the trace elements are helpful, and which ones are hurtful? im pretty set on regal tangs, and a pair of clowns, maybe some yellow tangs, what kind of price do these usually go for? what is the best way to introduce new fish to an established tank, i know i know alot of questions
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