When referring to tank size, does 60P for example, mean 60 gallons?
I'm new to the planted tank world but have had reef tanks for over 30 years. In the reef tank hobby, liters or gallons is usually used when referring to tank size. As I try and educate myself regarding planted tanks, I often see tank sizes referred to as 60P, 90P etc. Does the 60P or 90P reference also mean 60 or 90 gallons?