My system completed its cycling a little over 2 months ago.  I am raising a nice amount of lettuce and not much else.  I have 25 tilapia in a 180 gal tank.  The fish are 2.5 to 3 inches in length.  They eat like pigs.

The grow bed is 12 sq feet under 600w Metal Halide lighting run for 18 hours/day.

I have just had an infestation of aphids and white fly and am just now regaining control.  While doing this, I pulled my tomato plants and a very healthy canteloupe…