Aluminum in 80 gallon mixed reef tank.

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Dan Ponchak

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I lost a small Exacto #2 blade in my rock work and can’t locate it. Exacto rep told me it’s composition is 100% aluminum. Very small blade. Mixed reef,sps dominant, bare bottom. Did a cursory exploration by moving some of upper level aquascape to no avail. Employed magnetic search, nothing. IS IT SAFE TO LEAVE IN TANK? IF NOT,.... WILL I DO MORE HARM BY DISASSEMBLING ROCKS AND DISTURBING CORAL IN ORDER TO RETRIEVE? Hopefully it’s ok. What’s your opinion? 13 hours in. Thank you in advance. Dan.

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Phycodurus

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sorry to hear about this predicament! tank water volume will determine if the blade's eventual erosion is a problem. perhaps an ICP test now to determine a baseline reading, and then subsequent tests every few weeks/months. best of luck to you!

i have read that ulva macroalgae absorbs aluminum, by the way.
 
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Dan Ponchak

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Nobody? It’s been 24 hrs. No sign of distress. My tank is 80 gallons. The blade weighs
 

xxkenny90xx

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I agree with Phycodurus. Your best bet is obviously to get it out. Fwiw I once had an 8" pair of stainless steel tweezers rust and fall apart in a 120g reef and didn't notice any ill effects
 
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Dan Ponchak

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Thank you for your tip on the micro algae. More research for me. Any of you science types have anything? Aluminum blade weighs 1.33 grams. DT is 80 gallons. Sump is 30 gallons. Running carbon reactor, protein skimmer, socks, live rock and calerpa in refugium. Running a ”control blade” in a cup of tank water. Without exponential oxidation, eyeballs tell me that control blade surface will be covered in aluminum oxide(?), or rusty/white looking oxidation in about 100 days. Natural seawater content of aluminum oxide??? Will monitor my bug population as the canary in a coal mine. No observable I’ll effects observed yet. I’m not overthinking, just having fun with corona lockdown. Thank you again phycodurus. What’s it mean?
 
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Dan Ponchak

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My gut says that the slow rate of aluminum oxide creation is less of a concern than forgetting there's a razor blade hiding somewhere.
Thank you all for your input. Don’t know what it means but, before the introduction of the aluminum, my tank’s alkalinity was solid at 8.2-8.4. It’s been decreasing daily. Down to 7.7. Adjusted doser and continue to monitor. Coincidence or causal relationship? Anyone?
 

denash

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I had ICP come back with high aluminum which I attributed to ceramic biomedia, a couple of weeks after removing the biomedia my PE on all corals was like never before. Tested a few months later and reading on aluminum was normal, I would try and find the blade.
 
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BCSreef

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I don't think the blade is aluminum as it is too soft. Likely steel. The handles are Al. I would get it out. Use the magnet as previous poster suggested.
 

xxkenny90xx

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I don't think the blade is aluminum as it is too soft. Likely steel. The handles are Al. I would get it out. Use the magnet as previous poster suggested.
I would think steel as well (most razor blades are) but he said he talked to the company rep about it. ALSO, ALUMINUM WILL NOT STICK TO A MAGNET...
 
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