put a teaspoon in a couple gallons, and dump it in the sump. after a few weeks up it to 2 tsp, I would say the limit for your system is going to be ~3tsp in 4-5g, but break it in.
my tank is still just a little cloudy from its daily dose of 1-2 gallons, 20 min ago.
xenia is pulsing, frogspawn is fluffy and happy, LPS all tentacles out.