I’ve
ive always had big tanks. Now I’m playing with a 225 reef , 180 FO and another 40 FO which I may upgrade to a 150 or another 180Me my first personal tank was right around 86, had thanks up until 2001 the took a break. Back into it 2015 with my current tank.
I would say there are more then 10 and less then 100,000,000 reefers. Another good question would be what is the average size of reef aquarium, then calculate the total amount of gallons of water the are salt the aquariums