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I saw a banner ad for Dr. Tim's One and Only Nitrifying Bacteria on this site. Clicked on it out of curiosity and it appears to be a biological starter like Bio Spira. It was developed by Dr Timothy A. Hovanec who also worked on Bio-Spira. It appears that Dr Foster and Smith no longer sells Bio Spira but they sell the One and Only product. Marineland's web site no longer mentions anything about Bio Spira. Has Bio Spira been discontinued and is the new product, One and Only taking it's place? Has anyone used this new product? Does it work as good as Bio Spira?

http://www.drtimsaquatics.com/productguide/oneandonlyFW/oneandonlyFW.html
 

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Interesting. Looks like the same product with a new name, yes. Looks like the creator of the product has broken off and gone his own way. Unfortunately same bad info regarding toxicity of ammonia and nitrite. I wouldn't consider it 'not harmful' to subject fish to up to 3ppm of ammonia and/or nitrite. They even admit some fish are very sensitive to low levels on another part of their site, the FAQ. They also confirm there that you can do a fishless cycle with the product , but still say no reason to. That's disappointing. I think they're just trying to accommodate new fish keepers that are real anxious to add those first fish. Also probably don't want to get into coaching people through fishless cycling. I think a small bottle of ammonia should come with the product with directions for fishless cycling. They also need to drop some recommendations like adding the product when you do water changes. All that does is add to their revenue. There is some good info on the site though. Check out the FAQ section.

Also appears as if it no longer requires refrigeration. I guess that was a hassle trying to sell it online with overnight shipping. Now I guess we can't blame 'bad batch that wasn't refrigerated properly' anymore if it doesn't work. :)

I keep finding more and more :D They make it clear that they're not claiming instant cycle. They're only claim is to cycle a tank 'in less than half the time'. So what does that mean, 2-3 weeks instead of 4-6? Doesn't that mean fish are subjected to some level of ammonia and/or nitrite for 2-3 weeks?

I still recommend a $1 bottle of ammonia and some filter media from an established tank. Cycle in 8-10 days, costs $1 and you don't subject fish to ANY level of ammonia and nitrite.
 
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