Agreed Moose. This site has been a wealth of info for me since I started reading it. I've been soaking up info whenever I get a chance.
My fingers are crossed w/ the Osmo. I added it sparingly against the glass bottom of the tank. My PWC's have been done gently/slowly. No spikes per my master test kit. -all I have to test with. I also put a big bunch of hornwort in to suck stuff out of the water column. I can see it get bigger daily.
The funny thing is, hornwort or something similar will be all over the pond in front of my place in another couple weeks. I wouldn't dare tell neighbors I actually bought some.
i had my lights 6 inches above the tank rim, not water, i always kept my water lvl with the inside lip of the black trim, plus i have a lil bit of duck weed, hornwort, and a glass lid. lights were on 9 hours a day with only a diy co2 setup running non stop then a air pump pumping into the diffuser at a very low rate at night