Hey all! I’m having a strange issue with Zoa’s shrinking and regressing from previously very happy colonies, with three colonies being affected but a fourth growing faster than the other three ever have. I know zoas like a little more nutrients, and I have lowered the bio load of this tank a little bit over the past six months, but I don’t understand how the most recently added colony is doing so good while the established ones aren’t. Nitrates: ~0, I can’t tell with my test but there seems to be some, Phosphates: 0.05 ppm (last I checked was a week ago, but this has been a trend over a few months and phos has been fairly stable), PH: 7.9-8.2 daily range, ALK: 9 DKH (I’ve been dosing small amounts of baking soda to keep this stable), Calcium: 450, Mag: 1400, Salinity: 1.026
Pictures:
Happy colony, with last remaining green colony behind it
Last remaining green colony:
Orange colony (this one Is one of my first corals and never fully recovered from my first tank crash):
One of my favorites, used to be next to the wall and loved it but started regressing and the frag came disconnected from the wall:
Over the course of having these only the flow has really changed, but I don’t think they’re getting too much. Unless they don’t like a lot at night, I have my power heads turn up more at night. Lighting is set for LPS/softies so it’s not too bright, and has been consistent the entire time I’ve had all of these zoas. Any feedback is appreciated!
As a last thing my tank has a lot of limpits, is it possible they’re disturbing them at night?
Pictures:
Happy colony, with last remaining green colony behind it
Last remaining green colony:
Orange colony (this one Is one of my first corals and never fully recovered from my first tank crash):
One of my favorites, used to be next to the wall and loved it but started regressing and the frag came disconnected from the wall:
Over the course of having these only the flow has really changed, but I don’t think they’re getting too much. Unless they don’t like a lot at night, I have my power heads turn up more at night. Lighting is set for LPS/softies so it’s not too bright, and has been consistent the entire time I’ve had all of these zoas. Any feedback is appreciated!
As a last thing my tank has a lot of limpits, is it possible they’re disturbing them at night?