This.Heater
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Guppies will grow more quickly at 80 then at 70. Gestation will be shorter, but so will their lives. If you are breeding them for profit, you obviously want them to grow as fast as possible. Same applies to swords and platies. There are advantages to lower temps including higher dissolved oxygen content and slower/lower bacteria growth.
Everything I've read says guppies need to be at 72 to 80. I respect that we have a difference of opinion. Just goes to show the OP that there are different ways of doing things and do your own research to make an informed choice about your fish.
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Guppies will grow more quickly at 80 then at 70. Gestation will be shorter, but so will their lives. If you are breeding them for profit, you obviously want them to grow as fast as possible. Same applies to swords and platies. There are advantages to lower temps including higher dissolved oxygen content and slower/lower bacteria growth.
This.
I wonder if back in this days, people keep their tank heated with fire..
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