Help with temperature issue

[markster33139]

I seem to be having an issue in my tank where it seems to be on average about 4 degrees hotter than my house. For some background my tank is about 130 gallons rimless aquarium with good surface flow, and 2 Kessil LED lights. My skimmer is an Aquamaxx EM200 which has a very low wattage Sicce pump, and my return pump is a Fluval SP4. I chose this pump, because it is rated for 1800 gph at only 88 watts, which is as low as some DC pumps. My tank also has 2 Vortech MP40s, but they shouldn't add any noticeable heat.
Lately, I have noticed that the temperature seems to be getting warmer than usual, according to my Apex, and verified by 2 thermometers, one NIST calibrated, despite being in the midst of some very low temps in South Florida. Previously I had a different aquarium (80g) in the same spot, with the same equipment except the pump which was a RIO 2500 rated at 55 watts, and I did not have these temperature issues.

Can anyone help me identify where I might be having an issue, I really can't believe that my Fluval SP4 could be the culprit here.

 

[reefiness]

Are the heaters running longer than usual?

 

[Jetziel]

I say if you have any heaters going turn one of them off and see the temp change then, if its still the same turn all heaters off and just rely on your equipment's heat to warm up the tank (Powerheads, Pumps, Lights, Ect..)

I run 3 heaters on my system, one in the refugium and two on the overflow box, and i only run one unless it gets really cold outside (New England Weather) and i run that one heater at 72

 

[markster33139]

Being in S Fla the heaters are rarely ever on, I think only once since I bought them about 6 months ago, so I can eliminate that as a source of the problem

 

[Fish Keeper82]

What is your house temp?
Is this problem year round?

 

[markster33139]

I have actually noticed that this tank runs about a degree or two warmer than the previous tank with the 55 watt RIO return pump even though they shared all te other equipment. I thought the Apex was wrong and bought a calibrated temp probe and didcovered the Apex is actually reading about half a degree cooler. My house temp is about 76 year round, but with the recent cold fronts it has been down to 72 and still the tank is at about 76 to 77 during those times.

 

[alton]

Temporarily replace your return pump and see if the temp goes down. All internal pumps will add heat to your tank, also is your stand well ventilated? If not adding a fan will help keep the temp down. And it doesn't hurt to check the wattage usage on your pumps, some companies fib.

 

[markster33139]

Agreed I am looking to possibly acquire a dc return pump today to see if this makes any difference

 

[scooter31707]

Just let me ask, have you actually seem the heaters not come on. I am thinking your heaters are working to maintain at certain temp, especially when you said your house temp went down. You can unplug them and just see if the temp goes down any, if not it may be some equip that is giving off the heat.

 

[markster33139]

Yes I verified not on, but also have physically held it to make sure they sure it is not on, but it is on the Apex anyway