Marlon, I meant to say this a few days ago, but I am so glad you posted about this! I have been using the Flipper for a while now and love it, but I think it almost killed some of my favorite corals for this same reason. Last weekend a lot of my corals looked ticked off seemingly out of the blue...acros sliming, lps really withdrawn, zoas closed, etc. The only thing I could think of as the cause was a couple days beforehand I used sodium hydroxide to melt some brown palys that were taking over a rock. So I did a large water change and tested all the parameters; everything checked out just fine. But the corals were still ticked off the next day! I was so afraid I was going to lose my favorite yellow wall hammer that I pulled it out and put it in the frag tank to see if I could get it to heal there. That night I was laying in bed scouring the threads for ideas of what could be wrong and I saw your post, and bam, a light bulb went off and I remembered that I had just started leaving the Flipper in the tank earlier that week. I ran downstairs and pulled it out and sure enough, the blade had a good bit of rust on it. Of course I pulled it out and we are now 3 days later and everything is looking great again! Whew!
So, just wanted to say thanks for posting! You never know when someone will get some value out of it. It actually has made me want to be more active on here, because I have mainly been a consumer of the knowledge of you all and not a producer of any myself, haha.
You have had really bad luck with magnets, I'm still paranoid about mine.
