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Temperature Fluctuation in a High-tech Tank


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Hi everyone!

I've been battling BBA for the last month or so and got to thinking about temperature fluctuation. I'll share my setup below, but my question is more general (I know what kicked off my BBA hahaha). Will a few degrees of temperature fluctuation in a high-tech tank cause CO2 levels to fluctuate enough to cause algae?

I've got a 90g tank with an Eheim 200W thermostat connected to an external controller. The target temperature is 73-75 fahrenheit and the controller will only power the thermostat to get the tank back up to 75 if it falls below 73. I think it takes about 2 hours to go from 73 to 75, but I haven't timed it (I'm sure it's over an hour).

Me and the fish have been happy with the gentile rise and fall of the temps and reduced wear and tear on the thermostat, but I'm not sure if I'm making things harder on myself with the fluctuations.

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