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Old 07-27-2019, 11:07 AM
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Default Tank collapse

WTF HAS HAPPENED!!!!
Someone help me!!
This is the 6th tank i have built and so far, they have all florished.
This one crashed as soon as i planted it out!
The ONLY difference from the last 5 tanks is the expander foam i used.
I have used pond foam previously but i used a normal expander foam on this one.
Could this be a reason for the collapse??? The plants that were put into pots on the background have died within a week. So far the plant on the timber and also in the substrate are ok.
Anyone know if one of the foam ingredients could have caused this????




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Old 07-27-2019, 05:59 PM
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Default Re: Tank collapse

The only time I have ever seen this happen is when I used silicone instead of gorilla glue and not given it enough time to cure. Not sure if you used silicone?


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Old 07-27-2019, 06:43 PM
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My best guess would be the foam. I don't know if that's the only new variable you used with this build, but the large "POISON" label on the front doesn't inspire confidence lol. The list of chemicals in it sound a little angry too, I don't know if they are the same as the chemicals in pond and stone but I think propane as a general rule is probably not very good for plants. I'd heavily mist and drain the runoff to see if that will help rid the tank of any unwanted chemicals, or at least dilute them. Maybe the problem will fix itself and the plants will start thriving in a couple weeks. I'd be hesitant to put frogs in there until at least the plants are doing well though. Good luck!
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Old 07-27-2019, 07:15 PM
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Default Re: Tank collapse

I checked the ingredients for the pond and stone foam in the US and there were definitely differences. I'm sure you can check your pond and stone foam data sheets online and compare the chemicals with the foam you used this time.

If that's all you changed on your build, it definitely sounds like the foam is it.

Good luck hopefully the foam may cure in a longer time and become less toxic.
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Last edited by Dendrusernm; 07-27-2019 at 07:17 PM. Reason: spelling/grammar
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Old 07-27-2019, 09:46 PM
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I would rip it up and start over. Try to salvage what plants you can. I would probably rinse out the tank before I put frogs in there too. Is there any odor? That can is definitely the wrong stuff. I would just use the great stuff gaps and cracks. If you can’t stand the pee yellow color you can coat it with drylok/brown acrylic paint and then add your background material.
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Old 07-27-2019, 11:42 PM
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Default Re: Tank collapse

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Originally Posted by Reece93 View Post
The only time I have ever seen this happen is when I used silicone instead of gorilla glue and not given it enough time to cure. Not sure if you used silicone?


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Yeah, silicon layer over the foam then peat and aquarium gravel.


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Old 07-27-2019, 11:56 PM
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Default Re: Tank collapse

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Originally Posted by PhylloBro View Post
I would rip it up and start over. Try to salvage what plants you can. I would probably rinse out the tank before I put frogs in there too. Is there any odor? That can is definitely the wrong stuff. I would just use the great stuff gaps and cracks. If you canít stand the pee yellow color you can coat it with drylok/brown acrylic paint and then add your background material.


I havenít found Great Stuff or Drylok here is Australia so its always been a bit of a gamble what to replace these products with. I think tearing out the foam is a good idea, at least i should be able to replace that with the pond foam Ive used before.
Ah well, lessons learnt. Thanks for the advise everyone!!


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Old 07-28-2019, 03:44 AM
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I’m willing to bet this is not an issue of some reactive component of the foam but one related to watering, airflow and temperature.
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Old 07-28-2019, 05:23 AM
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Default Re: Tank collapse

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Iím willing to bet this is not an issue of some reactive component of the foam but one related to watering, airflow and temperature.
I'd like to echo this. The ingredients list looks very similar to a normal urethane expanding foam like Great Stuff.

Sometimes things like humidity, temperature, and the right amount of watering / misting just seem not to work like they are supposed to work. I remember once I had a plant from Glass Box Tropicals that had stayed exactly the same while sitting in its plastic bag for 4 days, then when I put it in a terrarium it utterly crumbled and disintegrated within 24 hours. Probably I wasn't actually doing everything right, even though I felt damn sure that I was.
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Old 08-02-2019, 12:10 AM
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Is that mildew? Lack of airflow will kill plants quickly.
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Old 08-02-2019, 02:05 PM
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Default Re: Tank collapse

That foam is an isocyanate foam, aka great stuff or any urethane(ish) type foam product. It reacts and cures very quick so the likeliness of that being the culprit is low.

Looks like a moisture/heat issue if you ask me. Molds like both.... I'd tear down and re-start. Not a pleasant thing, but in the long run you will just be battling a similar issue if you don't. My $0.02
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Old 08-02-2019, 03:30 PM
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Default Re: Tank collapse

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Originally Posted by DPfarr View Post
Iím willing to bet this is not an issue of some reactive component of the foam but one related to watering, airflow and temperature.


All temp, watering and airflow are linked and the same as the other 3 tanks. Thats whats strange about this one. The others are thriving


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Old 08-02-2019, 03:31 PM
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Default Re: Tank collapse

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Originally Posted by Evan Keller View Post
That foam is an isocyanate foam, aka great stuff or any urethane(ish) type foam product. It reacts and cures very quick so the likeliness of that being the culprit is low.



Looks like a moisture/heat issue if you ask me. Molds like both.... I'd tear down and re-start. Not a pleasant thing, but in the long run you will just be battling a similar issue if you don't. My $0.02


Yeah, thinking that would be the safest course.


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