h20 out of balance or seasonal change?
I've been struggling to lower my phosphate levels and they are finally coming down. My tank looks pretty good--plants look pretty good and algae is finally gone, but I'm convinced my tank is a little "off." Even though the plants look ok, they don't look lush, and they seem to have stopped growing.
28 gallon tank
2 X 65 watts power compact lighting
ph 7.2 (note: it's been running 6.6 but I messed up and put too much RO right in at the last water change, I also used 1 bucket of tap water every 3rd change and it got tap during the last change)
DIY C02 (hagen kit--bubble production has slowed since the weather has cooled and the temp has dropped)
tank temp 79 (runs 82 during the summer)
nitrate between 5 and 10 (I know this is a tad low--never thought I'd see the day when I added nitrate)
phosphate down to 1.0 (I know this is still a little high, but it's much better than it was)
I add between 1/8 and 1/16 tsp of the stuff Greg Watson sells once per week.
My question: Is it normal for growth to slow at this time of year, or am I not dosing enough of something?