is my tank safe? - The Planted Tank Forum
 
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post #1 of 15 (permalink) Old 06-02-2013, 06:22 AM Thread Starter
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is my tank safe?

trying to do a planted tank..
i made my own tank.

bottom slab is 3inch concrete..
side walls also 3inch concrete..
front and back are 10mm glass..


of course i will be waiting for the concrete to cure,

i will be coating the interior with super thoroseal..
for ponds, non toxic, pond safe.. sealers..

but is it ok to use on a planted tank?..
how would i do against algae? cleaning?..

Last edited by yanzco; 06-03-2013 at 07:13 AM. Reason: changed 3mm - 3inch
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post #2 of 15 (permalink) Old 06-02-2013, 06:43 AM
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As far as plants go, the tank is not really a factor. Plants just need water and nutrients. I would be concerned with getting a tight seal between the concrete and the glass. I don't know if aquarium silicone is made to handle such tasks. Assuming the tank will hold water, aesthetics would be your primary concern. Planted tank enthusiasts design tanks so that they can create beautiful pieces of art. If you can make your physical tank look good, then go for it. Algae issues probably wont arise or be resolved any differently than a normal glass or acrylic tank.


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post #3 of 15 (permalink) Old 06-02-2013, 07:04 AM Thread Starter
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i see, i would be using a neutral silicone that would stick to concrete steel glass, tested it on some glass and on some wall, its strong, actually had a hard time removing the test glass stuck on the wall..

i was worried that the porous part of the concrete, would become apartments for algaes.. but on the same time, bacteria too..

hope it works, a few more days and the concrete is cured..
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post #4 of 15 (permalink) Old 06-02-2013, 07:32 AM
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3 mm of concrete? I would think it would be too fragile. Unless I'm wrong 3 mm is about 1/8 of an inch which I could flick apart with my fingernail...Unless I'm missing something?

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post #5 of 15 (permalink) Old 06-02-2013, 07:48 AM
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What's the water volume? That's what counts...building a 3 gallon tank is different than a 300 gallon tank.

...also depends on the animals. Concrete exposed to the tank water will raise your water hardness and TDS...good for African Cichlids...and possibly some North American cold water species.

Last edited by Darkblade48; 06-02-2013 at 08:57 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #6 of 15 (permalink) Old 06-02-2013, 10:35 PM Thread Starter
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Quote:
Originally Posted by Sake View Post
3 mm of concrete? I would think it would be too fragile. Unless I'm wrong 3 mm is about 1/8 of an inch which I could flick apart with my fingernail...Unless I'm missing something?
o wait, i meant 3inches

calculated volume is 90gal
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post #7 of 15 (permalink) Old 06-02-2013, 10:48 PM
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Lol good you scared me there!

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post #8 of 15 (permalink) Old 06-02-2013, 11:53 PM Thread Starter
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its heavy, i think 2inches were good enough for the walls..
well.. 3inches is okay.. cant do anything about it now..

the bottom slab will be covered with substrate, and all concrete will be cured, and neutralized with a neutralizer.. so i think all is ok for ph..
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post #9 of 15 (permalink) Old 06-03-2013, 01:38 AM
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Probably way overbuilt. Here in Florida a lot of the fish farms use concrete vaults for caskets for tanks. Heck of a lot thinner than 3" for sure. I almost had 10 of them. Ugh.

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post #10 of 15 (permalink) Old 06-03-2013, 08:07 AM Thread Starter
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now im wondering if my stand could hold it...
approx water weight is 362kg for 95gal.
then the tank itself could weight more or less 100kg..
with hardscape and etc.. could become 500kg total..

my stand is built with coco lumber..
L 57"x W 25" H 3'

thick 8"x2" and 2"x3"
used concrete nails to nail them together..
then coated the whole stand with concrete epoxy to strengthen it,,

you guys think it can hold?..
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post #11 of 15 (permalink) Old 06-03-2013, 09:57 PM
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I've ran across plans for concrete tanks before, but I think they were usually big enough they didn't use a stand, and were just directly on the floor (possibly even foundation...)

As to the glass, I think most of them had a 'window' in the concrete box, and the inside was smooth. The plate of glass was bigger then the window, so that the pressure of the water pushed it up against the concrete - the silicone pretty much acted like a gasket.

I imagine any sealant that you use will fill in a lot of the pores, so that the concrete may still have a rough texture (depending on how you finish it, I guess).

I've also read about using ferrocement to build cisterns and water tanks and such, but I don't know if it would work well for this type of thing - it doesn't seem as 'precise' as poured/cast concrete shapes.
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post #12 of 15 (permalink) Old 06-03-2013, 10:05 PM
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What made you go with concrete as opposed to plywood or full glass? I've never heard of that build method before.


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post #13 of 15 (permalink) Old 06-04-2013, 12:53 AM Thread Starter
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well, we were having construction, so i was making use of some of the materials..
well the stand is strong, we placed alot of heavy stuff on top of it to test it.. total 450kg..

ill be using 3mm angle bars for frame on the exterior, to make use of the 'gasket' like if the water pushes the glass outward..

this weekend ill be placing the glass and everything together..
so hope evrything goes well.
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post #14 of 15 (permalink) Old 06-04-2013, 01:13 AM
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I just noticed you were from the Philippines. Concrete seems to be a common material for ponds and other water vessels in Asia. You should definitely post up some pictures of it. I'm really interested now.


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post #15 of 15 (permalink) Old 06-04-2013, 01:40 AM Thread Starter
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heres how i started..
on this thread.
https://www.plantedtank.net/forums/sh....php?p=3464834

you could see the stand i built there..
thou its not yet finish, ill be making it look alot nicer if everything goes well..

the slab there was still wet.

ill be posting new pics maybe tonight..
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