Ok, here is my answers.
I use Salifert test kits, P04 tests between .1 and .2. I have used Kents Phosphate sponge. I change 20 gallons of water once a month using Oceanic Salt, my light period is 5 hours from 2pm to 7pm. I have 5 emerald crabs, 1 pepermint shrimp, probably 10 red footed...