ML- one other thing to consider is natural fertility in your area maybe quite a bit higher than say the SE. This will make a big diff in your answer of tiliapia as sub for fertilizaiton program.
Ewest- once again well said
Woody- one thing to consider is it seems we do not get the large swings in phyto bloom since using water soluble vs liquid fert. Also with heavy feeding very little fert is necessary in many cases.
Ric- I have many clients that have the goal of 24-36" or similiar. They are not worried as much about DO crash more asethetics. THey like to swim and want to see more than 18 inches, etc. So yes you are right 24-36 is far more productive than 6 ft. vis. One potential probelm though and woody might have this one. IF you try for greater vis and have shallow edges many times fertilizing only makes it worse b/c encourages filamentous algae growth (ML if only we could stock tilapia)