I don't want to come off as the vape police, as everyone is different and all that...but for the love of god, please don't try salt nic on it. That tank is made for high wattage, and salt nic "shouldn't" be attempted for anything above like 15-20 watts at the absolute max (unless there is some new type that is low mil that I'm unaware of.) The Juul I would guess puts off 10ish watts for nic salts.
Of course someone will tell me that they do it all that time, etc...but I really worry about people hurting themselves. But those coils probably won't even work at that low of wattage.
For context, most people would use a 1.5mg or 3mg juice on those coils. Salt nic is usually 30mg or 50mg. So just doing some rough math, it's many, many, many times stronger than that. No judgement, but I just think it should be said aloud for safety.