bio balls and sand filters are actually still used in a lot of commercial installs.
they're rarely putting reefs in. They're usually just doing fresh or saltwater fish only tanks.
Probably small potatoes, but it gets under my skin, it's " ak-crop-rah" not "ak-roe-po-rah"
And TIL I've been pronouncing it wrong. lol
I'm just a %#@ -hole, 98% of Americans say it incorrectly.