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[quote=Steve Nguyen;88579]from what I read, good bacteria die off during cold months and new bacteria emerge again after water temperature warm up. my question is, at what temp will bacteria start to die and at what temp will new bacteria grows again in warmer months?
Steve
There is a lot of diffrence in climate zones , length of winter , max and min temperatures houers of day light age of fish sex of fish and you can go on and on . Some bacteria will live but the problem is more in the spring as to how long it takes to reastablish itself fully. For adult fish I have 2 greenhouse ponds and I keep the filters running . The females I try and keep at 48f and males can go as low as 44f . At these temperatures they still do a little grazing at walls of ponds and of course produce some ammonia . The important thing to do is water changes . In fact if the water gets too cold I use well water which is 50f but warmer if sprayed in on a sunny day to help raising the temperatrure . The depth of water and side of pond insulation helps in keeping a stable temperature which helps the bacteria
It works for me
Regards
Eugene
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