Same here! I'm returning after a decade absence. My phosphate is 0.03 according to my Hanna checker. What are you doing to maintain 0.07 and keeping it in the range you stated?In my old tanks I never even tested for phosphate. After returning to the hobby after 15 years I try to keep it between 0.03 and 0.12 and usually run at 0.07.
You are exactly where I am. Mine, however, stays around .3-.4.As it often seems, yet another timely QotD! I'm in the midst of trying to wrap my head around this whole PO4 thing right now.
Tank is just about to hit the one year mark, started with dry rock.
Last fall I had everything bottom out and ended up with dinos. Dosed up my nitrates and phosphates as part of the battle and everything seemed good, right on target. But sometime around Feb or March something changed and I can't figure it out for the life of me. PO4 has been rising at an alarming rate. I see people panicking because their PO4 is 0.08 (and I'm not downplaying that, different tanks have different needs). First I hit 0.3. A month later it was 0.4. Then my Hanna was flashing 200 and I had to dilute my sample to get a reading. Then diluting by half wasn't enough! Ok, full on panic time! Regular weekly water changes didn't touch it. Yesterday I did a 30% water change (the biggest I'm equipped to do) and actually saw a reduction, thank goodness. Still over the max on the Hanna checker but we take progress where we can get it. I'll do another 30% next week.
My goal for PO4 is 0.1. After dinos I'm afraid to go any lower.
People ask if I've seen anything negative from my high PO4. My kneejerk answer is always no, things look generally good. No algae (I'm honestly worried my CUC might starve). But I've started going through pictures and I've realized something isn't right. I lost 3 corals that pretty much gradually melted away (two montis and a cyphastrea). Stony stuff doesn't grow. Soft tissue seems to grow like crazy. I prune my Kenya tree every week. But anything with a skeleton is in stasis although looking generally healthy.
I'm lowering my PO4 cautiously. I'll be interested to see if things with skeletal structures start to grow when I get things under control.