There was not a temp difference with the giant pump.
I am using an inkbird controller and 2 300 watt Finnex titanium heaters in the sump.
I am using an inkbird controller and 2 300 watt Finnex titanium heaters in the sump.
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I have the same setup (75/30, shadow OF) but using Varios4 at 65% which is somewhere in the ‘hood of 400gph. I vote too much flow tooopen up the primary about 1/8 of a turn and wait 5 minutes. Then check it again.
I still think you have too much flow, or there is something else restricting your primary.