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Old 08-25-2010, 01:35 PM   #11
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GE silicone II has an anti mold & fungus agent in it that is super poisonous. GE silicone I for plastics is the only aquarium safe silicone i know of that GE makes. I believe the change was within the past couple years they added something called "bioseal." I could be wrong, could you post a link to exactly what you got?
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Old 08-25-2010, 01:44 PM   #12
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Found this link to Lowes, although it was purchased at a different store.

Shop GE 9.8 oz Silicone II Premium Waterproof Window & Door CLEAR Caulk at Lowes.com

I've been reading and from what I can tell there's two different kinds of GE Silicone II: Window & Door + Batch & Kitchen. From what I read the Window & Door Silicone doesn't have a mold inhibitor, but I could be wrong. I'll go to the store and double check. I used this before in the hand-held tube version and didn't have any issues. There are however MANY forums with people questioning if it is aquarium safe with mixed opinions either way.
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Old 08-25-2010, 02:35 PM   #13
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So I just went to the store and got a few different tubes of silicone. Both the GE Silicone I window & door + Kitchen & bath say that they release acetic acid while curing, while GE Silicone II says it releases methanol and ammonia while curing. All of them say it is not for use below the water line or in aquariums (legal disclosures, I'm sure. DOH!). They all mention some kind of mold free protection:

Silicone I: For a long-lasting seal, choose 100% silicone, not acrylic caulk, which can shrink and crack, leaving gaps for water to seep through. Those leaks can lead to water damage and mold growth.

Silicone II:100% silicone is a 3 hr. Rain-Ready and Sun/Freeze Proof caulk for windows and doors, as well as attics and basements, that also provides mold-free product protection.

Silicone II also mentions that it isn't for use below the water line, aquariums, AND where FDS compliance is necessary.

Thoughts?
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Old 08-25-2010, 02:59 PM   #14
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Thats my guess man. If its the windows and door stuff it should be safe, but people say the II has to cure for like 3 days so it wont release ammonia and other nasties. The I is safer much earlier.

I'm curious why it wouldnt show in your testing, but its my main suspect at this point. Secondary would still be something completely random that your stirred up on accident or got into your tank.
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Old 08-25-2010, 03:12 PM   #15
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*face-palm*

Yeah... I'm starting to think that it's more the fact that I only let it cure for 24 hours. Many say 48 to 72 hours, rather than the kind I used. I found other forums on freshwater tanks that someone used silicone to seal a rock wall and within two days his fish all died. Same with my fish: no visual signs other than the possible behavioral signs I saw while my foxface and blue tang were dying... difficulties breathing, swimming at weird angles, etc.

IF this is the case... I need new insight... if I take out the sump & replace the silicone, let it cure for the proper time, what else would I need to do? A 100% water change? Gradual water changes?

Now that I think of it I did use some on the overflow box as well but as this was permanently welded on with acrylic glue as well, it cannot be taken down & replaced. Does anyone think that these possible emissions will cease over time if left to dry longer?
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Old 08-25-2010, 03:47 PM   #16
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yuck. sorry man this kinda stuff is always hard to hear about, and I'm sure more crappy to have it happen.

I don't know what to tell you about the overflow. I would take a razor and cut out as much of it as you can. For the sump, do the same and reseal it with GE I, Let everything sit dry for as long as you can. You might even consider draining your overflow box and a little out of your tank to bypass it, and just run a HOB for a couple days.

I don't know if eventually it will all leech out. I would be worried there is something similar to copper and maybe it is in your rocks and stuff now. But thats worst case, and I have no experience with that. Maybe someone else knows more.
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Old 08-25-2010, 03:50 PM   #17
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I pretty convinced this is it. It's the only thing that was newly introduced to the system that could've killed the fish so rapidly. I'll start another thread on cleaning procedures...
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Old 08-25-2010, 03:51 PM   #18
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sorry man, hope it works out well. Did you have any coral or anything else effected?
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Old 08-25-2010, 03:59 PM   #19
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Thank god no corals... YET. I've had a fowlr for the last 5 years and with this upgrade I was planning to add them. Although the fish were only about $150... I'm concerned about everything else as well: I have a ton of LR and LS, and the two clowns have been with me for 6 years now and really have become like family to us. First thing when I get home I'm going to put them in a quarantine tank with new water til this mess gets resolved.
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Old 08-25-2010, 04:03 PM   #20
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Good plan. Consider lowing the salinity slightly to ease stress on them.
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