Loosing large SPS colonies

[Werbo]

Originally Posted by Aquattro

You should probably test NO3. If it's steadily increased over the years, it could reach critical levels. PO4 is even a bit high IMO. I aim for 0.00, hoping to be under 0.03ppm. NO3, I aim for less than 1ppm

NO3 could be high as I haven't ever tested. I've always vinegar dosed to control nitrates but never tested. My aim has always been off on PO4 but corals have done well especially Sept-March with PO4 around .10. Tried gfo and fozdown but never been able to maintain PO4 in the "ideal" range.

This scare is gonna make me a better reefer as I've had a long lucky streak just doing large regular water changes. Just hope I don't loose anymore large colonies.