LOL - you won't believe me...
shrimp food, shrimp pooh, 5 WPG PC lighting (6700/10k), slow co2 w/ reactor - 1 bps 24/7, 2 bulbblers in back, occasional dose of mosura calcium supplement (gh to 5-7), xp3 filter, r/o only, occasional iron when plants show signs of red loss, and only occasional K when i'm seeing leaf changes. India almond leaves for the babies. Inline heater (hardly used), inline UV sterilizer (24/7 but old bulb by now), and a chiller that pegs the temp at about 72.
I'm guessing my phos is off the charts (shirakura shrimp powder which I overfeed on purpose for the plants and shirakura shrimp pellets). My nitrates are low but when I push the food or hack out the plants I'm sure it spikes some (see some of my older shrimp pass on )
Plant load and bio load seem to handle it.
OH, and no water changes (last one I did was like march I think - I'm lazy like that) I do them when I hit a bump with the CRS - until that I just top off daily losses when I can hear my water running. As far as shrimp the most important 2 things I have noted would be the addition of higher O2 sat (lower temp and bubblers) does seem to keep them happy and the breeding rates were much higher w/ the mosura calcium and the almond leaves.