I was able to order from Chewy. I was worried as it was a synthetic blend. My vet was worried about legal issues. I was surprised it came in next day!
Its been almost 24hrs and he perked up. But my tank is only 30 gallons and my QT is only 4.5. Not sure how I will be able to due a 100% water change, it will clean out my DT.
I added 250mg to the 4.5 and will do a 2 day 100% water change instead.