78 replies to this topic

[Westie]

ive only got little tanks at the moment as im have a bit of a break from keeping fish, so small water changes are a piece of cake

[Labcat]

27 yesterday, 28 today in the outside tank. Had a 5W fan rigged to the light timer, but as of today I'll run it 24hrs for a while. I know it must be doing something as I have to top up the tank every 2 days from the evaporation when it's on.

L

[Fox]

Dumped a heap of XL sponge filters in (already had a couple in) and turned off the power heads. Dropped the temp by 2c. All tanks didn't get over 29c today. Pleased with that.

[Shane-o88]

My tanks were all over 30 today, that's living in the hills for ya

[sandgroper]

30's my red line point, then i crank up the old evaporative air-con in the shed. At the moment the day temp is getting to 29 and dropping down to 25 at night by morning.

[TheTexasCichlidMasacre]

mine were all up at 30 today but i got some hell thick insulation in the shed... but i havent finished it yet got 1 wall left... lol

[Shane-o88]

I have reverse cycle in my fishroom, it's not quite got enough to use it yet though.

[malawiman85]

I have 9 tanks in my garage (No insulation) all still hovering within a degree of 25. During the day I leave the door from my house to garage open with the evap air con from my house on and blowing through into he garage. still warm in there but not hot.

Outdoor pond tank was up to 27 yesterday with no controls in place. 

Tanks in my house are about 24 with air con on about 16 hours a day (Wifey and kids like air con).

[ice]

31.4 in the jack tank this morning, he still looks to be comfortable though. Might freeze some 2l milk bottles and put one in before work if it gets any warmer though.

[Androo]

After monitoring my three tanks inside closely, and the 50l being at 27, 150l at 27 and my 600l at 30.5 i now have a theory that the heat generated by my canister filters which are kept in the cabinet heats the water. Iv opened up the doors on the cabinet hoping it will cool the filters a bit. I did a large water change which made temp 25, and within 2 hours it was back up above 30 and even adding ice packs hasn't effect the temp.

[Leigh]

Will need more than one  . Does anyone recall Yr12 physics - specific heat, Q_Fusion, etc.

Having read your MJ thread recently Ice, your tank is ~1000L. Some back of the envelope calc show you would need 10kg ice to get 1degC temp drop.

Very basic rule of thumb in current temps (~30 degC) would need 1kg ice per 100L to acheive 1 degC drop.

 

I have included a web page that will do a calc if anyone else is interested for a quick indication on what would be needed in their own tanks.

http://hyperphysics....hermo/cice.html

[Fox]

If you have powerfilters inside your tanks that are only there for water movment, turn them off and add airdriven sponges or stones. You will surprised how much heat an internal filter will generate.

[Androo]

No internals in my tank

[Labcat]

Whatever Watts your canister filter is rated at, is the Watts of heat that is added to your water, especially if it is enclosed in the cabinet.  It's like adding a heater of that wattage to your tank!  Can't stop filtering of course.....

[Androo]

I may have to look at getting a filter like Jules has, in hold chiller from memory

[Labcat]

I am surprised how effective the little fan turned out to be.  My tank was going to be heading for 29 on Monday (27 Sat, 28 Sun), but by running the fan overnight instead of just when the lights were on, it peaked at 26.5.  Cheap cooling! 

[Androo]

Result of just having the cabinet door open. Didn't go over 28

Edited by Androo, 17 December 2013 - 08:04 AM.

[malawiman85]

Has anyone plugged heaters back in as a result of the cooler weather? My garage tanks are down to 23ish degrees... I know thats not extreme but was just wondering how others have gone over the last couple of weeks.

[BristledOne]

I've got two 3ft tanks that dont have lids on them, found both of them require a heater as I rarely use the lights. My 2ft however is the other side of the story because it's heavily planted and has a lid to stop escapees

[Fox]

Nope, if anyone is keeping Malawi's they will prefer the cooler end of the scale anyways
My tanks got warm today, hitting 28c. I'll just leave the shed door open and the pedestal fan on.