It took about 2hrs. I only had enough salt to make 10g but took out 15g. So I reused 5g that I took out. I made sure to put that 5g I reused in a clean bucket. The fish was doing good and eatting before all this. I didn't have and changes in water parameters and my clown did well with this big water change. I'm thinking it was to much stress but am not sure. The rock I picked up was cured. I have only done basic test kit and salt check so it could be something else as well. I'll be working at setting up my sump by this next weekend. That should help things out a bunch. I hope lol