new sump= Major problems
 

i went to Big als and bought a new sump made by megaflow this week. cost $400.00. ok so heres the deal bought the sump to quiet things down a bit now things are pretty quiet but my temperature went way up to like 81F and thats from 78F the other problem is the amount of water evaporated each day is almost 15 litres my walls are wet because of this. this is a 90 gallon tank i have a heater that now resides in the bottom of the sump and remains unplugged i have a fan over the top of the sump but still the temperature goes as high as 79F this fix is only temporary at best as the hot season is still coming any thoughts would be appreciated

What is adding the heat that wasn't there before? Some pumps create a lot of heat. Did you add any lighting?

i do have a pump that i used on my previous sump its the biggest pump rio makes it a 32 hf in my previous sump i had no problems though

Is this sump smaller than the old one? Reduced total water volume could cause the temperature to increase

the new sump is about the same size as the old one it does have a bacteria chamber however and that is closed off the rest is open

There must be another reason for the heat buildup. Apart from lights and a heater the only other source is your pump. Put your hand on it to see if it's overheating.
As far as all the humidity you're getting I'm not sure what could be going on there. I regularly run my tank at 81 and the tank is behind a display wall so the room isn't that large. My total water volume is a little over 350 gallons and I don't have a problem with humidity.
I just make sure I get good airflow to the room.

I'm guessing that the fan is new....added because you are trying to cool things down. It's the evaporation caused by the fan that is sweating the walls.

That's no answer as to what is causing your heat buildup though...

Chevyjaxon.... did you ever find out what caused the problem? I know this is an old thread, but I've just joined the site, am a newcomer to the hobby, and am having a similar problem.

I have a 110g tank w/sump, Rio 26H, submersed heater set at 74 degrees (in sump) and temp is sitting at 82-83degrees and this is without any lights on. So far I've only added sand and fresh water to make sure everything worked well and won't add any live rock to start the cycle until I can stabilize the first issue.

If anyone else has any suggestions, I'd appreciate them. I unplugged the heater and the two power heads yesterday just to see if I can isolate the problem. So far it has gone from 83 degrees yesterday to 80.6 as of this morning.

I thought perhaps it could be the back pressure in the Rio pump because the return outlet on the pump is 3/4" and my return (flex tube) is also 3/4" so I was told to use 1/2" connectors to get the two to join. But I've called the pet store and they have told me that even with that bottleneck the temperature could not possibly soar 9 degrees up from just the pump.

PS - All equipment is new.

Did either of you check if your thermometer is actually accurate, or use more than one?? Just a stab in the dark :)

I am going to double check mine this evening with another one. The one I have in there now is a digital type with the cord submersed in the tank. Being that I bought it brand new and saw it climb (when I first added colder water) and plateau, I would think it is. But I'm going to double check everything. If I spent a ton of time trying to figure this out only to learn it was something that simple; I'd go postal.