300gall tetra tank - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 10 Old 08-09-2017, 03:51 PM Thread Starter
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300gall tetra tank

I have a 300 gall ex marine tank that I would like to set up as a freshwater tank. My fish preference is for small tetras.
I plan on using play sand as the substrate and the old marine sump tank for filtration. Is anyone aware of pitfalls or suggestions on how to make this work and what fish would be compatible?
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post #2 of 10 Old 08-09-2017, 05:10 PM
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I'm not the best with stock but I'm sure alot you will have a lot of options and this sound like such an interesting tank i have to follow goodluck



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post #3 of 10 Old 08-09-2017, 07:44 PM
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In a tank of that size I would do a big school of Congo Tetras for the main show, and then fill in with maybe 3-4 large schools of smaller species.




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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 #4 of 10 Old 08-10-2017, 01:57 PM
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Welcome to the forum

A large school of Congos would be amazing! If it were my tank (I wish), I'd have Rummynose, Pristellas, and Emperor Tetras as well. My Rummys always stay together and they are fun to watch zip around in formation. I've never kept neons or cardinals so can't comment on those.

I used to be a fan of Serpae Tetras but they were aggressive aholes in my tank so I'd stay away from them.

Animal testing is a terrible idea; they get all nervous and give the wrong answers.

Last edited by Romad; 08-10-2017 at 02:00 PM.
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post #5 of 10 Old 08-10-2017, 04:10 PM Thread Starter
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I agree that a large shoal of congo's would look amazing, but I currently have a 75 gall tank with neons and other small tetras and these fish would be the prime stock for the new tank. Because of the size of the new tank 10'x2'x2' do you think I can get away with mixing large and small tetras especially if I have a lot of plants?
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post #6 of 10 Old 08-10-2017, 06:04 PM
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300gall tetra tank

There's no trouble keeping the larger congos with the smaller neons and the like.


"Reality is that which, when you stop believing, doesn't go away"

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 #7 of 10 Old 08-14-2017, 04:00 PM
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Dennisons barbs would also be amazing in that tank. I would do a large school of Congo's and Dennison's for the larger sized fish, a huge school of rummies (love these guys and they school together so well) and cardinals ( they are like little jewels... beautiful). This would be an amazing tank.

150 Gallon - Mostly American Cichlids
135 Gallon - Angelfish Community
75 Gallon - Odd couple (Polleni/Angelfish)
55 Gallon - African tank
20 Gallon Long - QT
10 Gallon - Empty
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post #8 of 10 Old 08-15-2017, 10:38 AM
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Quote:
Originally Posted by Dragonslayer View Post
I have a 300 gall ex marine tank that I would like to set up as a freshwater tank. My fish preference is for small tetras.
I plan on using play sand as the substrate and the old marine sump tank for filtration. Is anyone aware of pitfalls or suggestions on how to make this work and what fish would be compatible?
I don't have any advice, but I do think this would be a lovely tank, and I will certainly be following to watch how it develops! With a huge tank like that, you could have literally hundreds of fish, and to see them traveling in various schools would be beautiful!
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post #9 of 10 Old 08-15-2017, 01:02 PM
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Hoping you'll post pictures along the way, or start a Journal thread with pictures. Welcome back!! Can't wait to see how this turns out.
Congo Tetra's are impressive and will school together or even with some Rainbows. Rainbows and Congos are social together and 10' gives them a lot of room. "jealous"!!

Every kid, regardless of what they are going through, is ONE caring adult away from being a success story. ~ Josh Shipp, Teen Behavior Expert
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post #10 of 10 Old 08-15-2017, 09:42 PM
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I kept Congo's and Boesemani rainbows together at one point and it was a nice mix.

150 Gallon - Mostly American Cichlids
135 Gallon - Angelfish Community
75 Gallon - Odd couple (Polleni/Angelfish)
55 Gallon - African tank
20 Gallon Long - QT
10 Gallon - Empty
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