I definitely would go to a LFS, Petco, or Petsmart and pick up some standard IO and raise is ASAP. I, personally would raise it to 1.019-1.020 and then raise it .002 daily until you get to 1.025-1.026. I agree with everyone that you don’t want to raise it to quickly. Don’t try to mix the water stronger than normal to raise the DT salinity. Just mix it to your normal salinity and then use it to raise the DT salinity. The reason I say get some standard IO salt mix is that the parameters should be pretty close to most other salts.