So I have been wondering what is up with the corals and the tank and as stated before, I was convinced that there was some metal poisoning from Aluminum shavings. I couldn't find much about Aluminum's negative effects on aquariums, and my LFS owner said he hadn't seen much in the way of toxicity from Aluminum either.
I was staring at the acros tonight wondering why they just seemed "Off". There are still issues with some only showing partial PE, and some spots that look "burned". The colors looked wrong too. I finally figured it out - the acros are bleached! They are bleached like they would look if I did a massive overdose of Zeospur. There is still coral pigment, but when you look up close, the subtle dots and pinstripes of the zooxanthellae are gone.
I have Zeospur, and I've felt that it was an overrated product mainly because it didn't do almost anything to the acroporas in the tank when I used it. When I first got it I used it at 20% strength and got nothing, each time I used more and more. Eventually I was up to double strength! Still not much of a change, most corals still had visible zooxanthellae, but shortly after dosing there would be a reaction from the corals like they had been stung, pulling polyps mostly in, mesenterial filaments out. Once I had a mega overdose by accident, I was not paying full attention to what I was doing and added .5 OZ rather than the 5MLs I was intending, and the corals actually expelled pretty much all their zooxanthellae and looked a lot like they do now. I haven't added any Zeospur in months, mainly because I saw pretty much no positive effect.
What causes this when using Zeospur? Well, very little research has been done on this but copper causes the expulsion, but alone you need so much copper that you would kill the coral. In the presence of Zinc, however, much less copper is needed. I didn't add any Zinc, but that doesn't mean that another element couldn't have the same effect when combined with copper. I use FM Elements at about 2/3 the weekly dose one dose a week, Sunday morning. FM Elements contains copper and is already formulated to "gently" reduce the amount of zooxanthellae in the coral tissues. It is possible that the Aluminum that was in the water from he shavings combined with the trace copper I added with the Sunday morning dosing of FM Elements, causing a big zooxanthellae expulsion event.
Until I receive something to bind metals(LFS out of Polyfilter, had to order online), The corals are continuing to be irritated by the metals and are getting a little cooked by too much light. I will feed pappone tonight and reduce the daylight tomorrow to compensate, hopefully that will save the couple of corals that are struggling a bit. Luckily the new corals are doing just fine.