Zoanthids care.

[lariat8099]

Have had some Zoas in my tank and for some reason they are fading away some of them are so small I can only see them when my Radion lights are down low in blue mode. Can anybody help me out on what could possibly cause this? All of my parameters are good I’m wondering if my tank is to clean and if I should dose or add nitrates. Any help would be greatly appreciated my smaller tank before the one I have now was a red sea Max and I had tons of Zoe was in it but now that I’ve upgraded to a larger tank with a larger some with Cheatos in the sump I can’t keep Zoe was for some reason