hi all i just set up a 200L marine aquarium i have had a fresh water for a long time .i no how cycling works and how a skimmer works but not sure when to use it .do i use a skimmer when cycling will it just take longer for cycling .if so when will i start to use it and how often . do i leave it run all the time or just 12 haurs a day . the tank i am seting up is a fishless cycling and fish only tank.
thanks for your help