well, i suggest keeping the water not b/c of bacteria transfer, but to make it easier on the fish so that completely different water in completely different surroundings doesn't stress them too much.
and i missed the part about moving the current fish into the new tank since i didn't see your short post directly above mine. i originally thought you were suggesting that he move only the gravel over into an empty tank, not the fish as well. when i read "stabilized" i thought you meant cycled, not just waiting for the water to settle down, and i was confused.
mea culpa, mea culpa. . .
and i missed the part about moving the current fish into the new tank since i didn't see your short post directly above mine. i originally thought you were suggesting that he move only the gravel over into an empty tank, not the fish as well. when i read "stabilized" i thought you meant cycled, not just waiting for the water to settle down, and i was confused.
mea culpa, mea culpa. . .