how many lbs?

Live rock is a biological filter for your water so 1lb- 1-1/2lbs per gallon of water is the rule of thumb. You can buy mostly dry rock and seed it with some live rock to cut down on costs.
 
Live rock is a biological filter for your water so 1lb- 1-1/2lbs per gallon of water is the rule of thumb. You can buy mostly dry rock and seed it with some live rock to cut down on costs.

Buying dry rock is the cheapest, it will take up to 6 months work for the water to penitrate tjat far down for stable waters.
 
what do you mean by "safest"?

They do make grounding straps, but if your heater fails, pump fails, it is away from your fish and inverts. It only takes milliamps to kill fish and with plastic pipes( to and from display tank) that eliminates that worry. Lets use the word natural. You can use cheato and add tons of lr to bump up your bio filtration. Less rock in display equals easier to spot your fish. Pound per gallon, honestly im my opinion, in the display tank doesnt leave you with a hole lot of room
 
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