my leather corals...

[redsea250]

Hi, I have a large leather coral and a small one. For three days now they have being closed. I cheked the water parameters and everything is as follow:
ammonia: 0
nitrite: 0
nitrate: 0.2
ph: day 8.4 night 8.2
phosphate: 0
calcium: 460
And all the other corals seem "happy" everything else is "open".

Any advise would be appreciated.
Thank you

[RotaryGeek]

Is there any other corals near them that might be aggravating them? Maybe a crab or something bothering them? Water parameters are barely even important for leathers, they are some of the toughest corals out there, so i doubt that would be the problem. Did you just recently move them to a brighter spot? They can live in very low light, but too bright can make them close up for a while.

[jchase1970]

how long have you had them in that spot?

[redsea250]

I haven't move them from their original spot when they were fully open, and nothing is near them to sting them.

[redsea250]

how long have you had them in that spot?

They've been in the same spot for 3 weeks, fully open. It's just the past 3 days they've been closed.

[edwardlmarshall]

Leathers shut down from time to time to shed a layer of dead tissue, algae, and bacteria. It usually takes a day or 2, but sometimes a little more. During this time the polyps will not emerge and the coral's surface will appear shiny and waxy. As long as you have good circulation, it's not a problem.

[67Duster]

Leathers need a lot of flow to help them stay clean, and can even suffocate in there own waxy slime if not provided with enough.