I have the new Cobalt version of the MJ. Couple more bucks but not noisy. I haven't had any increase in temperature with mine, unless it's being compensated for with the controller which might be turning off my heater. So I don't THINK I have an increase in temp due to the pump.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.