Nutrafin Cycle Biological Aquarium Supplement, 1-Ounce

This stuff is really good, but for $6 don't bother. Get the bigger sizes, 1 ounce is nothing.

This contains 30ml. The directions say add 45ml per 10 gallons of water(25 day 1, 10 day 2 and 3) so buying 1 ounce is pointless.

I bought this to cycle my new 36 gallon tank, so I would need 4-5 of them to properly cycle it.

Just wish amazon added the amount of liquid you need for your tank, but I hope this review helps.

It's working fine, my fish is looking good and i have not to change the water so fast.

I think it is very good.

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