Some zoanthids bleaching! Any help?

[Mordoff]

Ive got some zoanthids bleaching in my tank. Im not sure why, all my params are fine and my lights are 4x39watt t5 bulbs. Some of my zoas are bleaching and some are just not growing at all. Any help???

 

[Akwarius]

Actually curious about this as well. This happened to me a couple of months ago when my nitrates hit zero. Some of my zoas have yet to regain their dark pigmentation.

 

[Mordoff]

Actually curious about this as well. This happened to me a couple of months ago when my nitrates hit zero. Some of my zoas have yet to regain their dark pigmentation.

Yeah I dont know what it is. I have some vivid rainbows that are messed up right now and barely opening and then I have some pinks thats are bleaching no matter where I put them under the light and my tubb blues are very light and dont grow at all.

 

[650-IS350]

where they started in the bottom and then gradually moved up as time passess?
or where they immediately placed mid to high up the tank rock work?

type of lighting? age of bulbs ?