pica_nuttalli
don't be a twit
a general rule of thumb is that coldwater fish need 10C to 20C water
sub-tropical fish typically prefer 20C to 24C water
tropical fish typically prefer 24C to 28C water
you are going to have trouble with each type whenever they are kept outside their temperature range of preference. people are warm-blooded animals, so judgements on what's "cool" or "chilly" are made in reference to what we think is "neutral". (i saw your forecast for today; trust me, most of us on this forum don't think of 23C as "cold winter weather"
) fish are cold-blooded animals. cold-blooded animals judge "cold" and "hot" based on their metabolic rate. too "cold" and their systems slow down until they just stop. too "hot" and their systems speed up until they break.
the biggest reason i suggest that you avoid coldwater fish based on your local climate is that it's a LOT more expensive and complicated to cool water than it is to heat it. although a large part of that cooling can be accomplished by keeping the tank in an air-conditioned environment, one severe power-outage or broken air duct and your goldfish will be suffering immensely from the summer heat.
most fish, tropical or no, suffer when temperatures exceed 30C. its just that tropical fish can handle that sort of shock better than coldwater fish because tropical metabolic rates are keyed to higher temperatures already.
sub-tropical fish typically prefer 20C to 24C water
tropical fish typically prefer 24C to 28C water
you are going to have trouble with each type whenever they are kept outside their temperature range of preference. people are warm-blooded animals, so judgements on what's "cool" or "chilly" are made in reference to what we think is "neutral". (i saw your forecast for today; trust me, most of us on this forum don't think of 23C as "cold winter weather"
) fish are cold-blooded animals. cold-blooded animals judge "cold" and "hot" based on their metabolic rate. too "cold" and their systems slow down until they just stop. too "hot" and their systems speed up until they break.the biggest reason i suggest that you avoid coldwater fish based on your local climate is that it's a LOT more expensive and complicated to cool water than it is to heat it. although a large part of that cooling can be accomplished by keeping the tank in an air-conditioned environment, one severe power-outage or broken air duct and your goldfish will be suffering immensely from the summer heat.
most fish, tropical or no, suffer when temperatures exceed 30C. its just that tropical fish can handle that sort of shock better than coldwater fish because tropical metabolic rates are keyed to higher temperatures already.
