Your corals look happy! That goni !! Do you have a second way to check your phosphate? Just to confirm your first test. Or test before and after your big water change? Just thinking out loud!
Dang I'd be leaving a bad review for whoever sold you that towel! That really stinks and only offer my condolences. I know 0 about glass damage but bright side is its above the water line! If you decide on a new one, if you stay around the same size you have all the gear needed!
Yep! Usually if I get a reading that makes me unsure, I'll pull out the Saliferts and test against those. In this case it was spot on but usually I see a little bit of fluctuation when comparing alkalinity.
That dang towel I tell ya..