Is this the right Dr. Tims one and only?

[Kengo]

Hi, I want to purchase Dr. Tims one and only at the best price. I need 2 oz and usually they are $18ish, but on amazon, there's one for $5. So I'm wondering if this is the correct product. Here's the product:

 

[Mykawl]

Yes I used that, it’s cheap because it’s only for 20 gallon tanks if I remember right. The next size up is 50 gallons? Not sure

 

[Spare time]

Hi, I want to purchase Dr. Tims one and only at the best price. I need 2 oz and usually they are $18ish, but on amazon, there's one for $5. So I'm wondering if this is the correct product. Here's the product:

Yes. As long as it says nitrifying bacteria then it is correct.

 

[Mykawl]

Don’t forget the ammonium chloride it’s well worth the $5 as well, you will need a food source for the bacteria