GBrymer Posted August 5, 2022 Share Posted August 5, 2022 Have any of you heard of or experienced Flourish Excel stalling the cycling process in a new aquarium? I have a new 20 long planted aquarium with minimal fish (2 corys, 1 female betta) and 7 plants that’s 5 weeks old. The cycle appears to have stalled with nitrites for about the last 3 weeks. I was told that the problem could be the Flourish Excel killing some of the beneficial bacteria and stalling the cycle. My plants are doing amazing and the fish are health, but I’m doing daily water changes to keep the nitrite levels down; 25% daily. Any suggestions? Thanks in advance. Link to comment Share on other sites More sharing options...
Seattle_Aquarist Posted August 5, 2022 Share Posted August 5, 2022 Hi @GBrymer How much Excel are you dosing and how often? -Roy Link to comment Share on other sites More sharing options...
GBrymer Posted August 5, 2022 Author Share Posted August 5, 2022 5ml every other day. That’s what my local fish store told me to do. Link to comment Share on other sites More sharing options...
Seattle_Aquarist Posted August 5, 2022 Share Posted August 5, 2022 (edited) Hi @GBrymer It is highly unlikely the Excel (which only contains about 1.5% glutaradehyde) is effecting your nitrogen cycle. However you are over-dosing the Excel. The initial dose after a water change is 5 ml per 10 gallons. The daily dose (or every other day) is 5 ml per 50 gallons, so less than 1/2 capful. Have you been cleaning your filter media and losing beneficial bacteria? Also, doing gravel vacs can cause issues with the nitrogen cycle. Lastly, check your tap water. If you read nitrites in your tap water chances are the test kit / test strip is not accurate. -Roy Edited August 5, 2022 by Seattle_Aquarist Link to comment Share on other sites More sharing options...
GBrymer Posted August 5, 2022 Author Share Posted August 5, 2022 Thank you so much! 1 Link to comment Share on other sites More sharing options...
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