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Turn you filter off, put tape at your water line. Remove tank water in a measured pitcher. See how many gallons it takes to lower the level 2". Measure the height of your tank from the top of the gravel to the tape line then do the math. Plants and aquarium decor to not displace that much water. If you have rocks and large heavy driftwood that is a different story. Err on the side of caution when subtracting the gallon amounts for them.JLeeM said:I'm battling this disease now. Lost 3 corys and my beloved betta.
When quarantining new fish to prevent this, can you do the salt treatment on them for 1-2 weeks and then add them to the main tank?
Also don't understand why it says 1 teaspoon per actual gallon, and 15 teaspoons or 5 tablespoons for 5 gallons out with water change. How do I determine how many actual gallons of water are in a tank already set up being as I just put water until it's full?