Well after using this silicone on the sump and on one bulkhead in tank and having some things dies. I did a little research, and I found that GE Silicone II is not safe for aquariums even though it says 100% silicone- which makes it not 100% silicone if there is something else in it. Well here is my question how do I make this right. Do I have to throw all the sand and rock out that I have in there, or can it all be washed or just remove the silicone and dont worry about all that? From now on I will use only aquarium silicone!

I'm pretty sure they changed Silicone II in the last few years. It use to not say it had "Bioseal" on the window and door.

I actually read a thread on this on a different forum "dendoboard". and someone did alittle research and got into contact with GE and they said it has always had Bioseal in it they just decided to market it and put the bioseal label on the can. So its been the same stuff. and ive herd its safe once cured, but also silicone does go bad and wont cure right if its old or wasnt capped after use.

the tube that I have does not have any indication that it does but it does say not for aquariums in small print on the back. And looking at the website for GE is has a Mold free label on the site not on the tube.

Brand new silicone from lowes...

well i just used GEII windows and doors to silicone my false wall in place. so i guess ill find out if its safe. =/
i used the same stuff for my vivarium with no ill effect.

GE II is going to kill all the bacteria in your tank. Yes, unfortunately you will need to start over. Use GE I next time.

Sorry man.

silicone l 100% only
I'm pretty sure all the silicone ll has mold/mildew resistant chemicals.

my thought is remove the silicone and reseal with silicone l 100%
maybe new sand at the most. I really can't see it leaching into everything but you never know.

there are 2 types of GE-II, mildew resistant - for bathrooms and moldy places, regular GE-II that is aquarium safe. Usually the mildew resistant tubes are marked as such.

what died in your tank Phaze?

fireworms, hitch hiker snails, one yellow tail. So am I going to have to throw all the sand and rock out or just wash it and let it set in fresh water and do water changes?

total of 90 pounds of sand-15 lbs of crushed coral- 30lbs of rock

ouch!

I think I am going to rinse it all, let it set in fresh water, do changes and try again.
way to much just to toss

sounds like a good idea. ya dont toss it!

I have used it in the past without any problems after letting it cure I usually fill with fresh water overnight then rinse well. Maybe something else is killing them.
Lately I have used Daps (black) and it seems fine too. Whether GE contains mold killer in all or not I have only used the tubes that do not say it is in there.
I think they all pretty much say 'not for aquarium' use though except the tubes manufactures market for aquarium use at higher price.

well from now on I am going to use only aquarium silicone.you should have smelled the sand as I took it out, smelled like vomit and butthole.....

well i actually changed my mind when i found some spots that felt like uncured oilyish spots on my falsewall near the silicone. "havnt filled my tank yet, still building" need less to say i ripped my whole false wall out bought Dap 100% silicone, stripped all of the old silicone of everywhere and sanded most the paint off my falsewall cuz it was oilyish. not fun at all. but rather be safe since the GEII silicone i used was a used can.

That may not have anything to do with the silicone. That's....normal. For an established tank at least.

There's a reason I don't have sand anymore.

From research on Dendroboard and the replies from GE themselves when questioned, all versions of GE II have Bioseal, whether marked on the tube or not. Also, not mentioning "unsafe for aquariums" doesn't mean it's safe.

As for GE-I, good luck finding it, many places just don't carry it any more.

this is what Im planing for my next biuld

http://www.technologylk.com/product_view.a...ategory_ID=1960

or

http://www.technologylk.com/clear-ge-1200-...lk-SCS1201.html

cheaper and actual aquarium silicones...
http://www.google.com/products/catalog?hl=...ed=0CB0Q8gIwAw#

cheaper yes, but what do you really know about it. hold strenght, cure time & depth, manurfacturer, etc....

is it just repackaged ge1, like most, or something else.

is it "actual aquarium silicone" simply because of packaging or do they garantee it aganst failure for use in aquarium's?



anyway..... the two I recomended are there for there strenght, and the fact that they have been used by many. to build rimless tanks with duedilagence placed apon the researching of there being reef safe as well as strong.