Under 'normal' (in any given year/season) Surface Iron fishing conditions in SoCal... What # class of line would be considered 'universal' and that everyone agrees is used 'most of the time' for Surface Iron Fishing...? 20, 30, 40 or 50...? Did it not change (gotten lighter) over the decades...? i.e. I heard that back in the 50's, 60's, 70's...The grade of fish were 'better/bigger', therefore back than, people fished surface irons with a pretty high # class of mono (50-80). My original train of thought is that the 'grade' of fish dictates the # class of leader you use...correct...? i.e. bigger fish = higher # class, smaller fish = lighter # class. So...in theory...there really is no universal surface iron line # class...correct...? But than again...I always hear people suggesting numbers around for surface iron and '40' gets thrown around a lot. Also...Let's not forget line # class as it relates to 'thickness' and therefore its 'resistance' in the water. Hence...higher # class for shallow/high/topwater presentations/retrieve. Likewise...lighter # class for deeper presentations and retrieves. Obviously...Where the fish are holding in the water column would also dictate which # class of leader you would also use...correct...? Does this theory only hold true for freshwater fishing only...? Therefore in saltwater...its 'no holds barred' and you pretty much use what you need to use in order to get bit or land a big fish...regardless of lure retrieval depth and line thickness resistance. Can someone skool me in the art of SoCal surface iron fishing...?