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Paul the holder looks longer in the picture than what it really is, it is only 4 1/2 inches.
I have a thermistor like the one that you have that is why the hole is exactly the same size as the hoses hole. The holder will be place where the baffle that divides the refugium and the return pump is...
It's been a week already since I switched tanks, took all the dead corals out, all of the ones that didn't die are doing pretty good and the ones that I thought will continue dying I fragged them and they are coming back.
Water parameters are kind of stable, the fishes are doing good too. Last...