What Causes Calcification to Completely Stop?

[mike810]

For the past few weeks, my ALK and CA uptake has completely stopped. I've been lowering the dosage because CA and ALK kept climbing and for a week straight, I have not dosed any CA or ALK at all.

I test every night hoping to see a drop in CA and ALK but they remain the same every time. I use salifert for CA and hanna+salifert for all.

This is just crazy, if my sps are not using the CA or ALK then at least the LPS should be using it. My sps do not look good, turd brown and some burnt tips from the ALK raising to 8dkh from 7dkh.

Salinity= 35ppt
NO3=2
PO4=0 (hanna)
CA=475
ALK=8
MG=1300

These numbers have not moved for several weeks now. I even switched my lights thinking the leds were not enough because the par was pretty week at 100ish on the corals (4 ai vega color over 8 ft tank). Now I run two 48" ati hybrids.

I'm stumped, please help. Some of my sps are in rough shape while others are doing okay. None have good colors.

 

[markalot]

My uptake stops when something bad happens. PO4 spike, Nitrate spike, Alk spike, or something else that rapidly changed. It's the speed of the change more than the raw number.

If Hanna reads 0 PO4 and you really achieved that low PO4 then things will die.

 

[mike810]

I thought lack of nutrients would make your sps pale?

Mine have browned out.