I have a ~120gallon setup, so based on recommended heater sizing I got 2x300W BRS titanium heaters on an inkbird controller. I also have an Apex for backup temp monitoring. The BRS website recommends 300W for "up to 100gal" and also put out a video awhile back that suggeated 2 smaller heaters...
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Expert level stuff here, but I want to share my own experience.
Everyone has their own husbandry and is entitled their their own-way-of-doing-things.
I have for awhile now been dosing 32ozs of tetraselmis phytoplankton algae that I brew on my basement in two big 5gal containers with spouts...