If I convert a established freshwater tank to a brackish tank will I have to cycle to tank again? Or will the bacteria be able to handle the change. I'm talking about maybe .10-.15.
That's not true. The SG depends on the quantity of salt added. It's not kryptonite! If you keep the SG changes to .001 or .002 at a time, you can avoid losing your bacterial culture. I've done it from pure FW (SG 1.000) to half SW (SG 1.010) w/out ill effects. You just have to keep it gradual.deangelo;492659; said:IMO when you add the M.salt to the fresh water set up its like nuking the tank cos the Marine salt in pure form would probably wipe out all FW bacteria..