Planted Tank Obsessed
Join Date: Jan 2015
Location: Newmarket, Ontario, Canada
I believe so, and hope someone else can confirm. It is likely your gH will be high as well. My 180g was also previously salt, and the kH crept up for a few weeks after going FW (even with cleaning prior like you).
This poses an interesting problem going forward. You should expect the remains of the salt water deposits to reduce over time, and the RO/DI you add will have to be mixed to keep up the kH and gH levels. For now it seems you are good, but I would measure the kH and gH for several days in a row to see if the levels have stabilized.