alanmin4304 Posted October 22, 2010 Report Share Posted October 22, 2010 You need to ask yourself if you would prefer them to survive or thrive. Quote Link to comment Share on other sites More sharing options...
phoenix44 Posted October 22, 2010 Report Share Posted October 22, 2010 Then there are the other aspects of stress as well. Ich does well in cold water and if the fish is stressed, you could just be fighting a never ending battle with Ich. Not worth it in my opinion. I know some cories do well at 21-23C. In winter cold water tanks would surely get colder than 18C. I know they get down to 7-12 degrees indoors down here. Quote Link to comment Share on other sites More sharing options...
Mcculloch Posted October 22, 2010 Report Share Posted October 22, 2010 I don't believe corys are a cold water fish however the largest Peppered Corys I've ever seen came out of pond that was being emptied. They had been In there for years In Auckland temperatures I found it pretty amazing at the time. Quote Link to comment Share on other sites More sharing options...
Joshlikesfish Posted October 23, 2010 Report Share Posted October 23, 2010 My record is 4 degrees indoors :oops: Man was that a cold sleep Quote Link to comment Share on other sites More sharing options...
gagaforfish Posted October 23, 2010 Author Report Share Posted October 23, 2010 My brother really wants corys, so he bought a heater today, and is going to have a tropical fish, instead of goldfish. Quote Link to comment Share on other sites More sharing options...
Joshlikesfish Posted October 23, 2010 Report Share Posted October 23, 2010 My brother really wants corys, so he bought a heater today, and is going to have a tropical fish, instead of goldfish. Thats the way to go :lol: Quote Link to comment Share on other sites More sharing options...
blueyes Posted October 23, 2010 Report Share Posted October 23, 2010 My brother really wants corys, so he bought a heater today, and is going to have a tropical fish, instead of goldfish. And so it begins......another fishaholic in the making Quote Link to comment Share on other sites More sharing options...
malevolentsparkle Posted October 23, 2010 Report Share Posted October 23, 2010 correct me if i'm wrong but a lot of 'coldwater' fish come from mountain streams in tropical countries and therefore can be happy in coldwater. Ive got golden barbs in an unheated tank and they are doing great, caught them laying eggs several times. pet shops sell many species of fish for coldwater and sure you don't want to put them outside or in an unlined room, but they are coldwater fish sold for unheated tanks. Quote Link to comment Share on other sites More sharing options...
phoenix44 Posted October 23, 2010 Report Share Posted October 23, 2010 some barbs from Asia, sure. Cories from South America; not so much. A true cold water fish will thrive in an unheated tank in winter when the temps get into the single digits. Quote Link to comment Share on other sites More sharing options...
Joshlikesfish Posted October 23, 2010 Report Share Posted October 23, 2010 A true cold water fish will thrive in an unheated tank in winter when the temps get into the single digits. Stores still sell fish under coldwater that don't :roll: Quote Link to comment Share on other sites More sharing options...
phoenix44 Posted October 23, 2010 Report Share Posted October 23, 2010 That's nice. Quote Link to comment Share on other sites More sharing options...
gagaforfish Posted October 23, 2010 Author Report Share Posted October 23, 2010 Thats the way to go :lol: I'm happy, goldfish would eat all the plants! Quote Link to comment Share on other sites More sharing options...
Ira Posted October 24, 2010 Report Share Posted October 24, 2010 You don't believe adaptation is possible? It naturally occurs in pretty much every species. But alright. We'll leave it at that If you had hundreds of tanks with thousands of cories and slowly lowered the temperature from 25 to 5 degrees over a span of 30 years I'd say odds aren't that bad that you'll have evolved a proper coldwater cory. Get to to work, Let me know how it goes. Quote Link to comment Share on other sites More sharing options...
malevolentsparkle Posted October 24, 2010 Report Share Posted October 24, 2010 some barbs from Asia, sure. Cories from South America; not so much. there are mountains in south america too. I don't know if pepered corys live in mountain streams but its not unlikely A true cold water fish will thrive in an unheated tank in winter when the temps get into the single digits. tanks shouldn't get down to single digits inside surely? Quote Link to comment Share on other sites More sharing options...
smidey Posted October 24, 2010 Report Share Posted October 24, 2010 :lol: Quote Link to comment Share on other sites More sharing options...
phoenix44 Posted October 24, 2010 Report Share Posted October 24, 2010 :roll: Look - http://www.planetcatfish.com/catelog/sp ... ies_id=271 15 C to 25C in the wild. Google - temperate. :lol: Tell me about it :lol: Quote Link to comment Share on other sites More sharing options...
malevolentsparkle Posted October 24, 2010 Report Share Posted October 24, 2010 Wild caught specimens require cooler, bright water... Not a fish for the discus tank, although hardy enough to stand high temperature for a while, it doesn't help the longevity of the fish. Quote Link to comment Share on other sites More sharing options...
phoenix44 Posted October 24, 2010 Report Share Posted October 24, 2010 It's not COLD WATER is it? Quote Link to comment Share on other sites More sharing options...
malevolentsparkle Posted October 24, 2010 Report Share Posted October 24, 2010 so i think the conclusion is that there are many coldwater fish, but that doesn't mean that they can live in any temperature or outdoors. any unheated tank needs to be monitored to ensure that the temperature doesn't drop below the minimum for that species and if it does then the tank needs to be moved to a warmer spot or a heater installed. Quote Link to comment Share on other sites More sharing options...
smidey Posted October 24, 2010 Report Share Posted October 24, 2010 this seems to be a similar debate to what is a big tank. it can come down to what we see in our own eyes as big or in this case cold water. i see posts of "un-heated" tanks, those tanks in certain rooms of the house may not get under 16 deg depending on the room temp. i think the real discussion is who thinks what temp is cold?? & what can cories cope with. personally i see a tropical tank 20 deg or more, a tempered tank (heater less tank inside) between 13 & 20 deg & to me a cold water tank is something 13 deg & under which more mimics the temps of our streams & river here in NZ. I have no idea what technically constitutes a cold water temp but that's just what i assume. Quote Link to comment Share on other sites More sharing options...
malevolentsparkle Posted October 24, 2010 Report Share Posted October 24, 2010 personally i see a tropical tank 20 deg or more, a tempered tank (heater less tank inside) between 13 & 20 deg & to me a cold water tank is something 13 deg & under which more mimics the temps of our streams & river here in NZ. I have no idea what technically constitutes a cold water temp but that's just what i assume. as vary few fish available to the hobby are native fish defining coldwater as the temp in the wild of NZ is pretty useless as we don't keep our fish outside. but we're arguing about definitions. really the fish sold as coldwater in NZ are sub-tropical - that why they can only live inside. Quote Link to comment Share on other sites More sharing options...
phoenix44 Posted October 24, 2010 Report Share Posted October 24, 2010 you do realise that goldfish can survive and thrive in lakes that are frozen over? Those are the true coldwater fish. Natives only thrive in very cold water as it is rich in oxygen. Temps that near 18- 22/23 degrees are temperate, and over that is tropical. The terms cold, temperate and tropical have to do with regions on the globe and their proximity to the equator, tropics of Capricorn and cancer. Quote Link to comment Share on other sites More sharing options...
Scottie841 Posted October 24, 2010 Report Share Posted October 24, 2010 Temps that near 18- 22/23 degrees are temperate, and over that is tropical. The terms cold, temperate and tropical have to do with regions on the globe and their proximity to the equator, tropics of Capricorn and cancer. This might be for you but I personally think of cold water as anything under 23 and tropical is anything over 24. Then it is really cold water when it has chunks of ice in it Quote Link to comment Share on other sites More sharing options...
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