Hello,
Apologies if this has been covered already (please send link if it has). My son and I have a 20 gallon long that is populated with a few Zoas, some GSP, and hammer coral. The Zoas are going brown. The water is great (we do regular changes and test for close to a dozen parameters). We suspect the Light. We are using a Joyhill (jayhill?) full spectrum light purchased off Amazon. We did notice that this light was too strong and the corals were not opening, so we partially shaded the tank lid. We then found the zoas over-extending to seek light. After playing with the shading, we still have not been able to get the corals to open fully except for the GSP. They are slowly losing their colour - even when adding supplements meant to help with this. We are thinking of changing to a single AI Prime 16HD using a flex mount. Does this seem appropriate? Any other thoughts?
Many thanks,
Ern
![35218742-29AE-46DF-B818-46F506D41287.jpeg 35218742-29AE-46DF-B818-46F506D41287.jpeg](https://test.reef2reef.com/data/attachments/2879/2879737-32a405154127462bb97e054b532de32a.jpg)
Apologies if this has been covered already (please send link if it has). My son and I have a 20 gallon long that is populated with a few Zoas, some GSP, and hammer coral. The Zoas are going brown. The water is great (we do regular changes and test for close to a dozen parameters). We suspect the Light. We are using a Joyhill (jayhill?) full spectrum light purchased off Amazon. We did notice that this light was too strong and the corals were not opening, so we partially shaded the tank lid. We then found the zoas over-extending to seek light. After playing with the shading, we still have not been able to get the corals to open fully except for the GSP. They are slowly losing their colour - even when adding supplements meant to help with this. We are thinking of changing to a single AI Prime 16HD using a flex mount. Does this seem appropriate? Any other thoughts?
Many thanks,
Ern
![35218742-29AE-46DF-B818-46F506D41287.jpeg 35218742-29AE-46DF-B818-46F506D41287.jpeg](https://test.reef2reef.com/data/attachments/2879/2879737-32a405154127462bb97e054b532de32a.jpg)
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