OK all you "Aquarium Xperts"! The cage (prefilter on Mag 9.5) ended up NOT being the sudden temp rise issue. I swapped sumps from a 20 to a 29, cleaned everything before putting it into the new sump and reassembled everything. Prior to this I had NO HEAT issues notta! My temp varied from 79+ to 80+ but NEVER over 81. Now suddenly it will not come down below 82! I'm baffled, stumped, stymied and any other word that relates to "confused"! Room temp is constant no change there. Opinions?
Temp question
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Is your heater in the sump? Could you have bumped the dial by accident? I do know heaters are very easy to break and if it was banged or bumped it could have messed it up.
Heater is in sump but I have swapped it out thinking it had gone bad and there is no change. I have increased the surface area (larger sump) pretty dramatically, in theory you would think this would help w/heat dissipation and not increase it.
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I would un plug the heater for a bit and watch the temp. If that's not it I would move on to the next piece of equipment and do the same. It nothing changes use a spare pump and see it it my be the pump.
But you said you just changed the sump out. You didn't happen to put warmer water in place to fill the sump?
But you said you just changed the sump out. You didn't happen to put warmer water in place to fill the sump?
I would blow a fan across your sump's water surface to cool the water down as you will be surprised at how much just a fan will cool it, but you will cause a little more evaporation in the process. Just keep an eye on how much and fast you want it cooled with the fan.
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That's a great idea. I use 2 computet fans connected to my apex when mine temp rises due to my mh. but you will still need to find the source as to why the temp is climbing that high. What is troubling is that you didn't have a problem until the sump swap. My money is on the heater. But if I lose collect the money from my wife. Lol
I actually used the water from the old sump and fuge (triple filtered) and put I back in. It sat at room temp of 70 for an hr or 2.
Edit: Well funny you guys both said that that's why I've had a delayed response I was putting a fan in the stand and shutting it back up! I used my lab grade thermometer, and I now says 80.5 in the display! Now I just have to watch it and cypher out where I need to be in the sump. Thanks guys
The pump is a new (month old) Mag 9.5. It feels the same as before IDK. I had swapped the heater out before the post. It's got me miffed for sure!
Capt. if heater is suspected then just unplug it for 24-48 hours as it will probably not come on during summer time here in GA anyway. Or I should say it shouldn't unless you keep your house at cold levels like in the 60's! 
The mag will put in more heat as compared to other internal pumps, but I still think overall it will have to do with air movement over the water. I have no idea what his system looks like so the fan idea was a shot in the dark.
The mag will put in more heat as compared to other internal pumps, but I still think overall it will have to do with air movement over the water. I have no idea what his system looks like so the fan idea was a shot in the dark.
Are ther any other submersible pumps?
I've have pumps go bad in which The coils go bad and partially short and cause heat, yet they work perfect.
impellers wear or get fouled up from animals or precipitation. This is regards to not spinning freely causing more current draw.
A another really odd thing. I tested all sorts of pumps internal and external in the remote past.
Small amount of Back pressure on the output, reduces current draw, less heat.
Small amount of restriction on suction increases current draw,increase heat
I've have pumps go bad in which The coils go bad and partially short and cause heat, yet they work perfect.
impellers wear or get fouled up from animals or precipitation. This is regards to not spinning freely causing more current draw.
A another really odd thing. I tested all sorts of pumps internal and external in the remote past.
Small amount of Back pressure on the output, reduces current draw, less heat.
Small amount of restriction on suction increases current draw,increase heat
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Actually cleaning the pumps could have caused them to run faster and create more heat. I wouldn't worry about 82 degrees anyway. My sytem ran at 82-84 for years
How are your evap rates? Evaporating water is inversely related to cooling so if the sumps were designed exactly the same the evap should go up and temp go down. If there is less splashing or water movement in the new sump u may have decreased the evap rates even though it looks like more area.