Terrarium Inside of An Aquarium - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 26 Old 09-28-2018, 05:42 AM Thread Starter
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Question Terrarium Inside of An Aquarium

Hey guys,
I am currently in the process of building a terrarium inside of a jar to close up and place inside of my aquarium. Obviously, the jar will not sink and so I have used my 3D printer and printed out a stand in order to place weights (rocks?) on to counteract the buoyancy force. I am struggling to figure out what I can use that is extremely dense to hold it all down. I am wondering if it is practical to take a block of metal (aluminum, or mild steel?) and coat it in candle wax? I have a bunch of rocks but as they are volcanic rocks, they aren't very dense. I understand that placing metal inside of an aquarium is a very tricky thing and I am curious whether the wax is 1. safe for the fish and will not screw with the water, and 2. whether the wax will be able to coat the metal well enough to keep it from oxidizing.

If anyone could shed some light on my question, I would be extremely grateful!

If I need to post pictures of what I am doing in order to better explain my question I have no problems doing so.

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post #2 of 26 Old 09-28-2018, 06:12 AM
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I think I know what you want to do, but perhaps share some pictures to confirm


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post #3 of 26 Old 09-28-2018, 06:15 AM Thread Starter
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Originally Posted by jaysee View Post
I think I know what you want to do, but perhaps share some pictures to confirm


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Of course! What would you like pictures of? I will be able to take them when I get home in ±3 hours.

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post #4 of 26 Old 09-28-2018, 06:58 AM
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If you are using steel, use Stainless steel. Also, aluminum is super light and would not help you.
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post #5 of 26 Old 09-28-2018, 08:01 AM
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After you add all the substrate to the jar, it will also increase weight. A couple of largish river stones inside the jar would also work well!

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post #6 of 26 Old 09-28-2018, 03:19 PM Thread Starter
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Ah, I didnt really think of that! I was just thinking of a bunch of quarter-sized rocks at the bottom of the terrarium, I hadn't considered using larger rocks, thanks for that suggestion! :)

--Will_1_Am

I have depression. But I prefer to say “I battle” depression instead of “I suffer” with it. Because depression hits, but I hit back. Battle on.
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post #7 of 26 Old 09-28-2018, 03:23 PM Thread Starter
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If you are using steel, use Stainless steel. Also, aluminum is super light and would not help you.
Okay, I understand that I would use stainless steel for the metal, but is it safe for the fish to be around pure paraffin in the form of candle wax? I am considering using this as stainless steel will eventually oxidize but the candle wax should be slow the oxidation process, right?

--Will_1_Am

I have depression. But I prefer to say “I battle” depression instead of “I suffer” with it. Because depression hits, but I hit back. Battle on.
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post #8 of 26 Old 09-28-2018, 06:34 PM
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So what exactly are you wanting to do? Place a terrarium below the surface of the water?


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125 - BGK, chanchito cichlid, pictus cats, silver dollars, palmas bichir
125 - cichlids (severums, bolivian rams, chocolate), rainbows ( turquoise, red), loaches (angelicus, zebra, kuhli and horseface), plecos (BN, RL and clown), denison barbs, tiretrack eel, pearl gouramis, betta
90 - Congo tetras, african knife, upside down cats, spotted ctenopoma, kribensis, delhezzi bichir
2.5 - betta
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post #9 of 26 Old 09-28-2018, 06:48 PM
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A cool thing I always wanted to do was put a fish bowl inside of a fish tank, where the bowl would have air in it for a fiddler crab or something. I would have the bowl upside down but at a 45 degree angle. I would silicone the bowl to the tank and place a heavy stone inside. Then I would run an airline into the bowl which would displace the water making most of the bowl full of circulating air as excess air is pushed out from the raised lip of the bowl.
You know what that’s something I might do now that I can only have one tank.... gotta make it cool!


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125 - BGK, chanchito cichlid, pictus cats, silver dollars, palmas bichir
125 - cichlids (severums, bolivian rams, chocolate), rainbows ( turquoise, red), loaches (angelicus, zebra, kuhli and horseface), plecos (BN, RL and clown), denison barbs, tiretrack eel, pearl gouramis, betta
90 - Congo tetras, african knife, upside down cats, spotted ctenopoma, kribensis, delhezzi bichir
2.5 - betta
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post #10 of 26 Old 09-29-2018, 09:02 PM
Interesting. I would like to see your pix too.

I am thinking stainless steel should not be a problem unless it's a saltwater aquarium. Flatware and cookery is often made of stainless. If so, this would ease some of your worries.

Oh, BTW. Did you know wax is edible and used in some foods to add shine and uniformity? It's true. Think candy.

I'm thinking wax, unless it flakes into the water, would not be a problem but I don't know the facts

Good luck with your project! 😆
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