Ya I've had a 5 gallon nano reef for quite some tiem and i recently put it all into a 20 gallon tank what i did was i mixed the salt water and go tall that stuff right but i left enough water out fo the tank so i could use my already set up water from my five gallon so i coudl in essence jump start the whoel thing....is that bad? i only waited about 5 mionutes then i transfeeredeverything from my five gal. : live rock corals and my sand substrate. but the top of my sand is brown would i simple vacuming take of it or am i removing necessary bacteria?