How much salt would you recommend for a 40 breeder then? With my math I get roughly 1.5 lbs of salt. Also read it's good to put it in the filters so it dissolves slower too. Would you agree?Catfish should be fine with salt at ~3% and heat at 86degrees. 50% water changes as suggested and replace the amount salt removed won’t the water. Patience (over 10 days) and water changes will get it better.