controller

Hi Guys,   I have been keeping tropical fish now for three years and I have  always wanted to keep discus fish. However they require quite low Ph and for years I have been told by the people in my LFS that the only way to do this is by using a barrel to collect rainwater or by putting a large...

Hi guys for those who you a temperature controller, what do you set your variance to ?    For example mine is set to 26.3 degrees C and it will turn on the heater when it hits 26 degrees C and turns of when it reaches the set 26.3  therefore variance of 0.3 degrees C.   Thanks for the help in...