Corals Not Opening as Much

[MitchM]

I agree with Brad as to the keep it simple approach, but I would do weekly tests for Calcium, Alkalinity and Magnesium. Even if your tests for those three are fine, it will help you understand how your corals react to different water conditions and give you peace of mind that there's nothing seriously wrong.

Don't worry about the iodide, stop dosing the strontium and Reef Snow.
Do weekly water changes, 10%

Large fleshy corals will frequently expand and contract. It is their way of processing waste products. Think of a sponge wringing itself out.
It can also be from poor water conditions, but your weekly water tests will tell you something is wrong.

Please tell us what salt your are using, the lighting you have and what the temperature number is.

[nondan]

Thanks for the advice their guys!

Ok, I have a salinity showing 1.022 with my hydrometer, and I don't mix my own salt. I buy 2 x 25 litre drums from my local shop which has kept me out of trouble with any issues from my tap water.

The temperature fluctuates between 24 and 26 degrees.

The lighting I use is a fully automated LED system, by Aqualina. It has white, blue and purple LEDs, I believe the purple are for coral growth.

I have a fair bit of water flow, nothing directed at any of the coral. A pair of aqua one 10000 wave makers, both facing up at the sump return line to create a ripple on the surface and turbulent flow.. I also have a Vortech MP10 currently set on short pulse mode, the corals do tend to sway back and forward when in happier states.

I am due for a water change tomorrow, so hopefully will see an improvement from their and will hold off on the strontium and reef snow.

[canadianbudz604]

That's why ur corals are mad, your salinity is too low. 1.022 is for fish only tanks, which is even low. 1.026 is the target.
U can bring it up slowly by topping your tank off with saltwater instead of fresh. But do it slowly because huge salinity swings is bad.

[nondan]

Thanks canadianbudz, I will also bring the salinity up a few notches over the next couple of days also.

Thanks everyone, appreciate all the input