I have 5 eheim heaters and what I've seen is that any time, they can be plus or minus 3'F. I use an Apex so I dont notice that effect but when I put the heaters in my QT, the temp swings a lot.
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180G Rimless Starphire 72x24x24 (Miracles)
3 x Ecotech XR15w G4 Pro | T5 x 4 | 2 x Mp40wQD
GEO 612 Cal Reactor | Vertex Omega 150 Skimmer | Chaeto Reactor
Synergy Reef CL44 Sump | Neptune Apex
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