what should I have on the 30 gallons to support the reef...like for example...pumps,filters,heaters,subtrate ETC....I got a Filter thats been running on Freshwater but nuthing in the tank no more....no fish,no ornaments,just freshwater and play sand.I got the heater in it too thats everything has been running for over 2 years now...used to have a convict pair in their....but sold them.Should I take all te water out and replace it with new declorinated water and added sea salt to it with a Hydrometer? Also whats the specific gravity for Reefs...? planning on have like 2 or so True Percula clownfish,a mandarin goby ( I lve the colorations in it ) some lil shrimps and a few crabs as clean up.Oh also what about a blue tang like in Finding Nemo? Can any of those lil boxfishes go into the tank with the clownfish and inverts.? or will they eat them or even kill them once in? Oh yea and im going to change my subtrate to live aragonite sand.Some live rocks and other stuff to accomodate after the saltwater is finalized in conversion