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Product Reviews
5493 reviews on 1118 products!

ProductsWater CareBiological Starters
Hagen Cycle
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Product Description:
Hagen CycleA concentrated bacteria that when added to the aquarium or filter chamber will initiate or strengthen the biological removal of ammonia and nitrate by beneficial bacterial strains.
Product Specifications:
One teaspoon per 10 gallons weekly. Available in 25ml, 1oz., 4oz., 8oz.
User Ratings: (31 reviews)
Overall: 5.31
Value/Cost: 4.45
Effectiveness: 4.68
Quality: 5.06
Ease of use: 7.06
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Found: 31 reviews Page  2 3 - View all
tongareefer71 has used this product for .
Overall Rating: 1/10 March 5, 2010
"save your money"
10% water from a established tank,used for the new tank,,will work better, and be free..only bio-spira or biozyme works at all.seeding gravel,or filter material also works better..so use 10% established water,seed gravel, and seed filter material..and your 3 times better off.Also, only add a few fish at once,in any tank at any time,then wait a few weeks to add more.
aFinFan has used this product for 3-12 Months.
Overall Rating: 2.75/10 September 8, 2009
Most LFS that carry Haagen prod.try to push this junk off on you claiming instant cycling do not believe them this stuff is garbage,there are much better ways to cycle a tank
KenS has used this product for 1-3 Months.
Overall Rating: 1/10 August 3, 2007
Used this when I started keeping fish. Has no noticable effect against cycling from scratch or from a seeded filter.
billd75 has used this product for 1-3 Months.
Overall Rating: 3/10 May 17, 2007
"Cycle is junk."
Get API Stress Zyme instead of this garbage. Cycle is mostly water, whereas Stress Zyme has way more "bugs in the bottle" than Cycle.
OmegaXX has used this product for 3 Years or More.
Overall Rating: 1/10 April 8, 2007
"This is horrible"
It doesn't do anything. Save your money.
inkedskin has used this product for 1-3 Months.
Overall Rating: 6/10 March 5, 2007
"decent for regular maintenance"
did not work at all for tank cycling, but if you have the time to add it frequently it does a good job of helping maintain bacterial control of ammonia and nitrites, or does it...
jgulecas has used this product for 1-3 Months.
Overall Rating: 3.5/10 January 8, 2007
"Didn't work for me..."
I used a bottle of Cycle when first cycling my tank. Was of no help whatsoever.
medinabob has used this product for 0-1 Month.
Overall Rating: 3.5/10 November 28, 2006
"No noticeable effect"
Tank cycled in normal time frame...wouldn't waste my money on it again!
spqrzilla has used this product for 3-12 Months.
Overall Rating: 3/10 November 14, 2006
"No noticeable effect"
I used this product to attempt to speed the cycle of a 26 gallon bowfront with some small cichlids for initial cycling. It did not appreciably speed up the cycle and in fact allowed ammonia spikes during the initial period. I also later attempted to use it to deal with a mini cycle when I mistakenly lost biological filtration by an inadvised filter media change and again did not notice any appreciable effect.

Given that I spent several weeks over both periods in daily water changes to manage ammonia and nitrite levels, I am definitely unimpressed.
tuccis8 has used this product for 0-1 Month.
Overall Rating: 1/10 August 13, 2006
nzpv03 has used this product for 1-3 Months.
Overall Rating: 4.5/10 August 4, 2006
"Didnt do A Dang thing"
So..this product did nothing for me...at the end of the BIG bottle... ammonia was over 8 ppm...I quickly switchd over to Stability...and my ammonia is down to 1 ppm and ni at .5 in less than a week...skip Cycle... if you can find Bio-spira you're in much better hands!
discuslover1991 has used this product for 3-12 Months.
Overall Rating: 8.5/10 July 18, 2006
"good stuff if you add it once a week"
no the strongest but not the weakest. Much better than stress zyme
Kennef06 has used this product for 3-12 Months.
Overall Rating: 8.25/10 May 22, 2006
"Recommend highly"
Used this product to cycle my tank and it certainly helped. I did not see a spike of any significant amount. Great product!
Michael6 has used this product for 0-1 Month.
Overall Rating: 5/10 November 27, 2005
"Doesn't work"
This is my first time using Cycle to accelerate my setup. It acctually came with that Waterhome Kit. Thought it was gonna to be really easy. But, it turned, I've already lost one fish due to high level of Nitrite. At this point, I'm changing more than 1/3 of water everyday and the Nitrite just won't come down. I gave 2 capsule per day since I start to see increase of ammonia. Still, the Nitrite wouldn't be easily defeated, which made me draw the conclusion that this product may only work for ammonia and it's definitely not as effective as advertised even with increased dosage.
Paulbearer has used this product for 3-12 Months.
Overall Rating: 9/10 September 30, 2005
"Did what it said it would"
I've used this to set up my 100 gallon and 75 gallon tanks. It cycled my tank out in 3-5 days with not a problem. I checked everything and it was already right where it should be. Added fish and didn't loose any. I don't know why others had problems, but there is issues with getting bad batches if the transport was mishandled (xtreme heat, cold) and that can be blamed for it. It was worth the purchase for me though.
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