Aquarium Dude Posted June 3, 2007 Report Share Posted June 3, 2007 Cann anyone tell me why the twmp in my tank fluctuates so much it seems to vary by about 2 degrees? Ps. Its a 450l tank inside the house Quote Link to comment Share on other sites More sharing options...
Bluetom Posted June 3, 2007 Report Share Posted June 3, 2007 Is it getting too hot or too cold? and how quickly, in 400L it should take a while to change temp. try having a thermometer just outsude the tank and see if the temp varies the same in the room, if so your heater is not keeping the tank warmer than the room and you may need to just turn it up. or if it's getting to hot, ie the room is getting warmer thn you would like, either fork out for a chiler or a few frozen coke bottles of water in the top during peak heat will work,(sort of in 400L) If however the fluctuations are hotter than the surrounding room, then your heater may be getting stuck. Could your thermometer be broken? Quote Link to comment Share on other sites More sharing options...
Ianab Posted June 3, 2007 Report Share Posted June 3, 2007 Does it fluctuate with the room temperature? Mine will vary 2 deg between a warm day / cold night. The simple aquarium heaters aren't exactly a precision device, and having the thermostat in the same tube as the heater element must cause some innacuracy. I would also suggest that if it's room temperature variations it's not going to harm the fish, it's almost like the natural cycle they would get in a stream or pond. If you aim for 25deg (or whatever your fish prefer), 24-26 wont hurt. If the temperature variations are random though it could be a sticking thermostat, keep an eye on it and maybe replace it. Cheers Ian Quote Link to comment Share on other sites More sharing options...
smidey Posted June 4, 2007 Report Share Posted June 4, 2007 i wouldn't worry about it, mine fluctuates by 3 deg sometimes. in the wild the temp would surely go down from time to time. not sure how much water ways would go down at night, anyone know? Quote Link to comment Share on other sites More sharing options...
SpidersWeb Posted June 4, 2007 Report Share Posted June 4, 2007 what temp? how big are your heaters? For a 410 Id have a 300 and a 150 or a pair of 200s. Sounds like they're not powerful enough to keep your water heated or you've set their temp to a lower value than your room is during the day. Quote Link to comment Share on other sites More sharing options...
alanmin4304 Posted June 4, 2007 Report Share Posted June 4, 2007 That would be quite normal for a bimetallic thermostat which is what is used on heater/thermostats. The only way to get a more constant temperature would be to use a far more expensive electronic thermostat. I have a set up with electronic thermostats and it fluctuates even more than yours for other reasons but the fish don't seem to mind. Quote Link to comment Share on other sites More sharing options...
Aquarium Dude Posted June 5, 2007 Author Report Share Posted June 5, 2007 I have 2x 300w heaters I was just wondering, I guess it doesnt matter :lol: Quote Link to comment Share on other sites More sharing options...
smidey Posted June 5, 2007 Report Share Posted June 5, 2007 in my 200L i have two 150w heaters. prob more a problem with my cheap inaccurate aqua one digital thermometer than the actual temp. Quote Link to comment Share on other sites More sharing options...
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