When it comes to the nano version of maxspect razor its effective coverage is probably more like an 18 x 18 area.
For a 36x18 tank, will 2 units be sufficient to greatly minimize shadowing/dark spots? or would it take 3 units?
For a 36x18 tank, will 2 units be sufficient to greatly minimize shadowing/dark spots? or would it take 3 units?