Help me I.D. my problem please, and tell me what to do

[lukinrats]

I have a few corals that seem to be having some dead tissue. At first I thought it must be direct flow related, because both of the acros are in relatively identical places, in my Vortechs outputs. Now I have some yellow porites that are having a problem, and it should not be coming from too much flow.

I did change one of my T5 bulbs from a 3000k to a 12000k color. This problem started at the same time as that. That is pretty much as far as it goes. I have checked PO4 and NO3, and both are unreadable

I have been racking my brain, and I can't come up with a single other problem that may be causing this. I added about 35 snails recently though

What usually are the biggest causes of this besides High Alkalinity and PO4, NO3

Here is a full tank shot from yesterday. Everything else in my tank, seems to be doing just fine. I know my picture skills suck, but maybe this gives some kind of idea of what I have going on

 

[Herpervet]

When in doubt. Water changes, water changes, water changes. Given that it is multiple different genera I doubt it is parasitic.

 

[NVTE]

Did you acclimate your corals for new light? New bulbs put out more light than old one. Your corals could be bleaching/ die due to new strong light.

 

[lukinrats]

Did you acclimate your corals for new light? New bulbs put out more light than old one. Your corals could be bleaching/ die due to new strong light.

Well, I actually checked PAR before and after the bulb that I changed. It was only 1 bulb, and the PAR stayed pretty much the same. Unless it was from a spektrum change, it should not be the lighting. I changed that bulb about 3 weeks ago now, and only 1 of the corals was acting wierd then. If you look at the FTS you will see that the lime in the sky acro is on the left up high in the stream of the vortech, and the blue Acro on the right in the stream of that vortech. I figure that has to be part of it. Then I don't really know about the porites.

I think that those 2 acros have not had a prblem before because they were not very big. Now it seems that they have grown out into that sort of direct flow

 

[lukinrats]

Not to mention that it isonly those 3 having issues. All others are healthy with good PE and color

 

[toothman]

looks like high kh or too much gfo

 

[lukinrats]

looks like high kh or too much gfo

Well my alkalinity is 7.5-8 dKH. That's where I try to keep it, but it did swing down to about 6 dKH a couple of weeks back. I thought high Alk at first so I bought 3 different test kits to make sure my readings are good, and they are all right around 7-8 dKH

why too much gfo? What's up with that? I don't know anything about that. I did turn my reactor off though

 

[myaerica]

If you use to much gfo right away your alkalinity can drop. thers an article out there somewhere about gfo and alk.

 

[lukinrats]

Ok, so I think this was caused by either of these things

#1. Alk dropped from about 7.5dKH to 6 or maybe lower

#2. Alk dropped from Gfo

I have since turned GFO off and also my Alk is staying steady again

So now what?

 

[lukinrats]

The lime in the sky was the worst, so I took off the piece On the very bottom right, where it had started to encrust onto the live rock, and mounted it. Hopefully that will save that one for me

Any suggestions on the blue acro. Should I frag it? Should I just move it? I have not ever really had any trouble with my corals. At least not where they start growing algae on them