I actually did have something very strange happen this week in the deskmate though. Last weekend I did the first deep clean. I pulled out all the equipment out the back and cleaned it all. Drained all the water out the back sump cleaned it up a bit. Did a 100 percent water change and pulled the entire scape and gave it a scrub and stirred really good the sand under the rocks.
Reassembled the entire setup and put fresh saltwater in. Waited a day and tested the nutrients. Nitrates were good. Phosphates a tad lower than I wanted (0.03). So I grabbed my trust bottle of phosphates and added the usual 3 drops that I add when my phosphate drops that low. Well come yesterday I test the phosphates (3 times). And the Hanna checked was blinking .90 and I almost fainted. Everything looks fine and nothing is closed up. So I’m basically just slowly brining it down with diluted lanthanum chloride.
I don’t fully understand the “equilibrium” with the rocks and bound phosphate and the phosphate in the water column. I’m wondering if because of the deep clean and me disturbing the equilibrium. The rocks leached bound phosphates back into to the water in an attempt to re establish the equilibrium. I probably have that concept way wrong. Hopefully one of you can enlighten me