Zoas and RFA closed for a month

[Cheezehead]

Hello,

Just curious about why for last month my fire and ice zoa's and rfas have been closed. Most of my other corals are fine.

I started my tank back up after i moved about 2 years ago. I placed my zoas and rfa in tank about a year ago. They have been doing well til last month. My parameters seem normal and stable. Now about a month ago, I had to change my return pump and that is when these corals started going south. My new pump has a little more flow then my last pump. Can a small change in flow cause these problems? I read about foreign voltage in a tank and thought maybe my new return pump might cause some voltage issues in my tank, even with a grounding probe. But i wasnt able to detect any foreign voltage. In my mind it has to be something with new pump. Also i noticed my white sand is starting to get a little red film next day after i clean the tank each night. Its nothing normal that i havent seen before on my last tank but it started happening last month also. I measure most parameters every other day. I also do a 10 percent water change every Saturday. I use reef energy A and B and occasionally use Reef Chilli for my corals.

Here are some of my parameters measured today.

salinity 35 ppm
temp 77.6
calcium 430
alkalinity 8.5
magnesium 1330
phosphates .01
nitrate 2 ppm
ammonia 0

My test kits are red sea except for alkalinity. For that i use Hanna.

Any ideas? My fire and Ice zoas were really pretty and spreading and would like to get them back to looking nice.

Thanks,

Paul

 

[xxkenny90xx]

Your Po4 is lower than I like to see, has it always been that low? You mentioned a ground probe, are you also using a gfci outlet? Did you test voltage with a voltmeter?

 

[ryan-23]

What is your tds in your RODI?

 

[Cheezehead]

Hello yes my Po4 have always run that low. I am adding NeoPHos a little bit at a time to try to raise that level to around .02. I have heard when its low this could cause zoa's from closing. I will add some more on my water change tomorrow and see if i can raise it some more.

Yes i have the ground probe in a GFCI outlet. I used a voltmeter to detect for voltage. I didnt think a voltmeter work work for this but saw a bunch of videos using one so i gave it a go. It didnt detect anything.

I use a Bulk Reef 5 stage RODI system. The preinstalled TDS meter shows zero on output, the input usually runs around 140. I assume the TDS meter works okay. It seems to always read zero on output and i have a schedule when to change all the filters. Shoud i get a seperate TDS meter?