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Can Great Stuff leach chemicals into water if it isn't covered in silicone? And for the parts of the Great Stuff that I want below water, after I cover them in silicone should I put peat moss over them or leave them bare? Will the peat come off in water? I want a muddy look to the banks.
 

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The silicone should be fine submerged... but I have a different suggestion all together.. There is a product very similar to great stuff called "Handi-Foam" comes in a similar can to great stuff ..but the kicker is that it's black instead of yellowish/white.. eliminating the need to silicone.. I believe some of the sponsors of dendroboard still sell it.. I swear by it .. best of luck...
 

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The silicone should be fine submerged... but I have a different suggestion all together.. There is a product very similar to great stuff called "Handi-Foam" comes in a similar can to great stuff ..but the kicker is that it's black instead of yellowish/white.. eliminating the need to silicone.. I believe some of the sponsors of dendroboard still sell it.. I swear by it .. best of luck...
I agree with this. I've never heard of "handi foam", but I know local hardware stores sell another expandable foam similar to great stuff, but it's called like waterfall foam. It's black just like Eric said about the handi foam. Only downfall is it is quite a bit more expensive than great stuff.
 

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I've always found the handi-foam for about 7-8 bucks.. definetly more expensive.. but its worth it in my opinion.. no silicone no mess , and no white spots glaring through..Lay your tank on its back .. spray it set your driftwood on , pile on the coco fiber , coco husk whatever you prefer and let dry...
once its dry , you can stab it w a pencil and stick broms right to it... best background hands down...
 

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Very interesting. So you just put the coco fiber right on the foam when it's still wet?? I've never tried that. I think the waterfall foam costs about 7 or 8 bucks as well. Probably the same stuff, just with a different name.
 

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Great Stuff sells a pond foam called Rock and Pond foam. It is $8 at Menards it is black as well. I have looked at HD and Lowes and they don't carry it. I do like the fact it is black......I never thought about adding the cocofiber on while it is wet......Will try that out next time. I do beleive all of them are inert once cured and will not leach chemicals out. I know for sure the pond foam wont and I have seen it used on ponds, freshwater tanks and in some marine reefs.
 

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My buddy told me the the HD by my house sells the pond foam... I guess some sell it and some dont.
They do sell a pond foam but it is like $15 can where the GS is half that.....They could by you definitely worth checking out.....
 

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I have no visible issues of health problems that I can relate to GS. Its a closed cell foam so water should not be able to enter and leave the system. I have used the handi foam as well, and the only difference I noticed is the color. People have been using GS for years and have had long lived frogs that breed successfully.
 

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What I do is spray the stuff on , then dump an excess of coco fiber and whatever else in .. a few inches on top .. then pack it down... just remember the foam will expand, so if you dont cover it sufficiently you will have bare spots.. but the background being black helps for sure... I usually stick a peice of Driftwood in .. let it cure for 24 hours or so then just brush off the excess.. it's the perfect background in my opinion ... this is a picture of a 30 cube I did the background on a few years ago .. pics taken the other day..
 

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Both my local HD and Lowe's sell the stuff. Same product with a diff name for each store. It's called Smart Pond at one place and Total Pond at the other.... read the cans and both have same manufacturer info. The only place I've found the GS Rock and Pond around hwere is at an ACE. I'll never use the yellow stuff again.
 
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