WATER CHANGE

[smithrc]

just to throw another view in the mix... We juast add cold water - maind temperature, straight down a hose...

of course we de clorinate the tank first but the temp drop id marginal...

depending on the temp difference of tank and the tap water the fall is only a couple of degrees for a 25% water change.

 

[gixer]

just to throw another view in the mix... We juast add cold water - maind temperature, straight down a hose...

of course we de clorinate the tank first but the temp drop id marginal...

depending on the temp difference of tank and the tap water the fall is only a couple of degrees for a 25% water change.

totally agree.

just not a small tank

 

[smithrc]

big tank small tank - it dosnt matter its still the same percentage of warm to cold water


10gal tank

7.5gals at 27deg - 25% change with 2.5gal of water at 20deg means the temp will end up at 25.25deg.

a 200gal tank

150gals at 27deg - 25% change with 50gal of water at 20deg means the temp will end up at 25.25deg.

 

[CFC]

A 25% water change on my 200g tank during the winter causes the temperature to drop from 26c to 20c which is too much of a drop in a short period of time for the fish to handle well, i usually have to add around 15 litres of hot water from the kettle to keep the temperature up around 24/25c.

 

[Nidge]

Wow how long does that take CFC?

 

[gaya]

big tank small tank - it dosnt matter its still the same percentage of warm to cold water


10gal tank

7.5gals at 27deg - 25% change with 2.5gal of water at 20deg means the temp will end up at 25.25deg.

a 200gal tank

150gals at 27deg - 25% change with 50gal of water at 20deg means the temp will end up at 25.25deg.

ahhh very smart

 

[smithrc]

A 25% water change on my 200g tank during the winter causes the temperature to drop from 26c to 20c which is too much of a drop in a short period of time for the fish to handle well, i usually have to add around 15 litres of hot water from the kettle to keep the temperature up around 24/25c.

hmmm... I havent actually checked the water temp now its winter

 

[Bignose]

I have a good reason to let your water sit out for some time: If you have a lot of dissolved CO2 in your tap water, your tap water could have a significantly lower pH. Normally, if the tank is buffered enough it is not terrible.

However, I like to replace the tank water with water exactly the same as I took out of the tank, so I fill an old 10g with water, and have a small heater in there and run an old filter to agitate the surface. I actually usually just refill it each time I do a water change, so that in a day or three when I want to do another one, the water is exactly the same pH, temp, hardness, oxygen content, etc.

 

[MrMashashin]

What i do when i do changes is i hold my hand in the desiganted tank for about 5 min. then quickly run it under water and once I feel the same temperature as in the tank ( hand isnt hot or cold) I will fill the bucket, dechlorinate, and dump in.

 

[Discomafia]

Your hands are in the tank for 5 mins? This isn't necessary... What I do during a WC is vaccum the water and gunk from the bottom, then bring the bucket to the sink, swish my hand in the bucket water for a little to gauge the temp. On the tap water, let it run for a while, then try to get it to the same temp. as the bucket water, using the back of my hand to estimate the temp. Then fill er' up, back to room, transfer thermometer to new water in bucket toget temp, and usually it's just 1-2 F off the tank temp. Then dump in the water, and all set for another week.

 

[gixer]

big tank small tank - it dosnt matter its still the same percentage of warm to cold water


10gal tank

7.5gals at 27deg - 25% change with 2.5gal of water at 20deg means the temp will end up at 25.25deg.

a 200gal tank

150gals at 27deg - 25% change with 50gal of water at 20deg means the temp will end up at 25.25deg.

ahhh very smart

i'm still not convinced...surely more water even though the percentage is the same will hold the temp better..

hmmmm maybe not now i think about it lol

but 100 gallons of warm water with say 25 gals changed with cold ( 25%) will keep its temp better than 10 gallons would would with 2.5

now i'm lost

and probarbly very wrong hahahah

 

[andyM]

I'm lucky in that i have an electric shower. It's fed direct from the cold water supply so doesn't sit in a tank like the hot water, and i just set it to the lowest temp and its exactly the right temp for the tank.