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Mixed opinions around here about tin but aluminum is not an issue for acropora. Some say leathers are negatively affected but no personal experience.That sucks! I'm sorry for the losses. I too lost a couple of acros this month and several others are severely damaged, but luckily the bonfire wasn't one of them. It got a little damaged at the tips, but it healed within a few days and is growing and looking better than ever. Contact me at the end of this and I'll send you a frag for free as long as you pay for shipping (providing it's still alive and doing well then).
The tank wasn't looking great after my last update. I sent in an icp test, but I didn't wait for the results before I did a water change. I knew something was wrong, but I just wanted to know what. Turns out I had tin and aluminum. I have no clue where it's coming from. My last test said the same thing, which I sent in for the same reason. I've checked all potential causes and everything looks good, so I'm at a loss. It might be leaching from the plumbing, which could make sense, but the tank has been running for over a year now. I'll have to stick with biweekly water changes until it either disappears or I figure out what's going on. I always rinse my arms with hot water for several minutes before putting it in the tank and I have a 200gpd 7 stage rodi filter, so I don't think it's from that either. No rusted metals near the tank from what I can see. If any of you have had heavy metals in your tanks that seemingly came out of nowhere, did you ever find out what the cause was?