Some people say to add gradually in increments over a 24 hour period. I have done it slightly more aggressively (increments over 8 hours) for treating SA cichlids with ich. Dissolve the salt in treated water and add to the tank gradually/ increments.Just a question, 18grams per 1gallon of salt figures out to 2.98 pounds for 75 gallons. But 3 pounds of salt for 100g equals to 2.25 pounds for 75 gallons. I am confused because it’s different. So you said use max dose of salt so go by 18 grams instead of the 2.25 pounds? Is this added slowly or just dissolve and add in after water change and new dose Erythromiacin?
Probably 2.25 - 2.5lbs should work. The salt is meant to relieve the osmotic pressure which is what we are trying to do.
Be advised that live plants can be impacted or die due to salt. Also, always suspend/ stop of using carbon in filter while using meds.