Issue: 3 Acan corals, a bubblegum Digitata Montipora and a Trachy all suddently retracted to the extreme. The acans and monti had been doing very well and growing. The Trach was purchased and introduced (I believe just days after the acans/monti retracted).
All other corals (~60) appear to be happy and growing.
After a month of complete retraction the 3 acans have died. The Monti and Trachy show no sign of change.
I've been running carbon for weeks thinking it might be some toxin but it hasn't helped.
What would specifically upset these corals but not others?
ICP test results are all in green with exception of Lithium which is elevated/ yellow grade: 332, reference range: 0-200.
sg 35
alk 9.0
nitrate 15
phos .07
Ca 425 (trying to raise it a bit)
Ph 8.0 - 8.3
Historically the Nitrate was in the 30's and Phos was 0.3 - 0.4 and I've been successfully been working to bring this down. All corals were happy with these levels but GH algae was taking over.
Thanks for thoughts
All other corals (~60) appear to be happy and growing.
After a month of complete retraction the 3 acans have died. The Monti and Trachy show no sign of change.
I've been running carbon for weeks thinking it might be some toxin but it hasn't helped.
What would specifically upset these corals but not others?
ICP test results are all in green with exception of Lithium which is elevated/ yellow grade: 332, reference range: 0-200.
sg 35
alk 9.0
nitrate 15
phos .07
Ca 425 (trying to raise it a bit)
Ph 8.0 - 8.3
Historically the Nitrate was in the 30's and Phos was 0.3 - 0.4 and I've been successfully been working to bring this down. All corals were happy with these levels but GH algae was taking over.
Thanks for thoughts