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Stocking a 20G Long
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Horsejumper902
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Joined: 17 Feb 2006

PostPosted: 2012.04.05(Thu)10:53    Post subject: Stocking a 20G Long Reply with quote

I recently purchased a 20 gallon long aquarium. Currently, I have a 10 gallon set up that contains 2 bronze corys and 1 otocinclus (there were many other fish, but they have sadly passed away under the care of my parents while I've been away at school). I'll be setting up my new aquarium in my apartment so I can look after it. I'd really like to move my fish from the 10 gallon into the 20g long as well.
So right now, the tank will have:
- 2 bronze corys
- 1 oto

I am looking for suggestions on what else to stock my tank with. I won't even be setting up the tank for over a month, so I have plenty of time to plan, but I want to start getting ideas.

I am very interested in:
- a group of neon tetras
- a group of zebra danios
- a few more cory catfish
- a few more oto suckers

How many of each of these fish would fit in my tank? (keep in mind that I already have 2 bronze corys and 1 oto)
Or if you have any other stocking suggestions or see any problems with this stocking, please let me know.
I've never had anything larger than my 10 gallon so I'm very excited to be moving up to a larger tank.

Thanks for your input in advance Smile


Last edited by Horsejumper902 on 2012.04.05(Thu)16:55; edited 1 time in total
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nikelodeon79
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Joined: 08 Nov 2007
Location: Wisconsin, U.S.A.

PostPosted: 2012.04.05(Thu)15:18    Post subject: Reply with quote

The bronzes are still much too large for a 20g tank. If you absolutely cannot find a new home or get a larger tank for them, I guess you could keep them but I wouldn't stock any more. Generally, it's a good idea to stick to the same species of corydora to get up to the proper numbers but in this case, I'd recommend just getting a group of something else... perhaps pandas, or even smaller ones like pygmy or habrosus.

I would not put zebra danios in a 20g long. I would go with a minimum of 3 foot tank for them... preferably 4 foot.

As far as otos are concerned, you will need to supplement their diet but your one oto certainly would appreciate friends.

In sum, I would stick with neons, a smaller corydora, and around 3 otos. Neons are much better in larger numbers so I wouldn't add a fourth species.
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diademhill
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Joined: 18 Apr 2007

PostPosted: 2012.04.05(Thu)16:21    Post subject: Reply with quote

Actually a 20 gallon long at 30" could house the bronze corys but not danios and no more otos.
You could try a couple or three albino bronze corys and/ or wild type to make up a group of five and then choose 6 neons (or I would try harlequin rasboras) as a shoaling fish.
A nice Betta would finish of the tank.

Are you keeping the ten gallon running?
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Horsejumper902
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Joined: 17 Feb 2006

PostPosted: 2012.04.05(Thu)16:58    Post subject: Reply with quote

I really was hoping the 20 g long would be large enough for my bronze Corys! I have had them for over 2 years now and they are doing well, but I realize that a 10g isn't a good size of tank for them.

As a side note, my oto did used to have a friend, but he sadly passed away over Thanksgiving. I would really like to add a couple of otos to my tank, if at all possible. They were very cute because they would always be together. I supplement them with algae wafers to make sure they don't starve!

I won't be leaving the 10g set up; my parents are tired of taking care of it and I won't have room for 2 fish tanks in my apartment.

With a school of neons (maybe 5-7), and 2-3 otos, how many total Corys could I keep in my tank? I'm leaning towards trying to get a smaller species like you suggested, pandas would be perfect if I could just find any around here!
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diademhill
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Joined: 18 Apr 2007

PostPosted: 2012.04.06(Fri)0:58    Post subject: Reply with quote

You need to transfer everything, filter, substrate, decor and some of the water from the 10g to the 20g to avoid a cycle spike. If you want to change substrate, eg to a cory friendly sand, put the old substrate loosely in stockings and lay these over the new substrate for a couple of weeks.

Wait a couple of weeks before adding any more fish - ideally at least a month. If you get the decor right the tank will look good with just the three fish you have.

Cories need to be in same species groups so if you add three bronzes that is half the tank stocking. You don't have room for a second species with your bronzes. Wait at least a couple of months before getting otos then you could try two but these, as you have found, do not often thrive except in specialised tanks.
Half a dozen is an OK group size for neons and that would be plenty of fish for you tank.
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Horsejumper902
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Joined: 17 Feb 2006

PostPosted: 2012.04.06(Fri)7:34    Post subject: Reply with quote

Thanks for the advice! Here is my problem, though - while I realize it is very important to transfer as much stuff from the old tank to the new one, I am not going to be able to transfer much water, except the water that I have my fish travel in.
My tank's new location is actually a 5 hour drive from the old one - so of course I do have an issue with figuring out how to safely travel with my fish. I was going to create another thread for that, but if you have any advice, I would appreciate it.
I will definitely wait to add more fish to my tank. I'm satisfied just watching my Corys swim around and I want to make sure everything is OK.
I wouldn't be adding Otos if it weren't for the fact that I already have one, and he is very lonely without his friend. His friend actually thrived for a year and a half before he passed away - he developed a red bump on his tummy and was dead within a few days.
Again thanks for your help, and if you have any traveling advice to make the trip safer, I'd appreciate it.
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nicolaas
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Joined: 25 Jan 2012
Location: South Africa

PostPosted: 2012.04.06(Fri)9:21    Post subject: Reply with quote

http://www.aqadvisor.com/
This is a grate site.

There is space for 4corys and 4 oto's. If you keep them like this they will be very happy.

What filter do you have?

Some pet shops will put oxgen in the bag for you if you ask them.I go allot of fish at a pet shop, they put oxgen in and I drove 1000kl and they all are alive and well.
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diademhill
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Joined: 18 Apr 2007

PostPosted: 2012.04.06(Fri)9:37    Post subject: Reply with quote

nicolaas wrote:
http://www.aqadvisor.com/
This is a grate site.

There is space for 4corys and 4 oto's. If you keep them like this they will be very happy.

What filter do you have?

Some pet shops will put oxgen in the bag for you if you ask them.I go allot of fish at a pet shop, they put oxgen in and I drove 1000kl and they all are alive and well.

Actually four is not enough for a group of corys and that site is not accurate.
There is an article on travelling fish and I'll try & find a link -oxygen is not needed but a coolbox is a good investment. The key to moving the fish is treating the filter media as if it were a living creature. Putting the media loose in a bag of tank water and then reassembling the filter at the other end should keep the bacteria alive.
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Horsejumper902
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Joined: 17 Feb 2006

PostPosted: 2012.04.06(Fri)22:04    Post subject: Reply with quote

Should I move the filter to the new tank even though it is not large enough for the 20 gallon? I'm kicking myself for this, but I purchased a 5-15g filter from Walmart a couple of years back instead of a 10-20 gallon one.

My tank I actually bought used and it came with a filter, which I'm unable to identify right now, but it is HUGE and I think he said it was "emperor" brand.
I threw out the gravel that came with it because it had mostly very large rocks which I know aren't good for my Corys, and I'd like to do sand instead anyway.
EDIT: I checked it out and the filter appears to be the "Emperor 280" power filter. Hopefully this is a good one. It looks very powerful.

Would it be a good idea to leave the old filter cartridge in the filter to contribute its bacteria? It doesn't look like it was used hardly at all. Also, should I replace the bio-wheel or not?

What sand is Cory-safe and wallet-friendly? And will tank maintenance be any different with using sand? (I usually siphon my gravel, does this work the same with sand?)

Also (sorry for all the questions, I'm helpless) what is a safe way to clean my tank, filter, heater, and lid/light? Everything is covered in this gray/white scum stuff and I want my tank to look nice and pretty before I set it up.
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diademhill
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Joined: 18 Apr 2007

PostPosted: 2012.04.07(Sat)2:05    Post subject: Reply with quote

You clean the tank with vinegar, salt and elbow grease. Then you rinse & rinse again.

Play sand is usually fine for cories but it takes a lot of rinsing - a third of a bucket at a time so you can swirl it up and then tip the water. You still use a gravel vac but the technique is slightly different. I use a bend in the pipe to control flow.

The old filter cartridge will be dead. can you find me a link to the cartridge it takes.
Test the filter (on a bucket of water ) to see if it works before spending anything.
Your old filter will work on the new tank and support your current fish easily. It is usual to run a new filter alongside an old one for 6 weeks.


Last edited by diademhill on 2012.04.07(Sat)7:50; edited 1 time in total
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