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Hi I have a new 20 gallon tank that has been running for over a month now and I was wondering what type of fish I can put in it
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There are all sorts of small fish that can go in a 20 high. Is the tank cycled?
 

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What are the dimensions of your tank? There are 20 highs, 20 longs and 20 regulars. The actual dimensions of your tank will ultimately depend on how many fish you can get.

I, personally, would go with a coupla schools of barbs or tetras as my main swimmers and then get a school of corys as my bottom swimmers.
 

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What are the parameters of your tap water? Some fish have very specific needs, others less. The GH (general hardness) and pH is what we need to know; you can find this out from your municipal water folks, likely their website will have data posted.

Byron.
 
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What are the dimensions of your tank? There are 20 highs, 20 longs and 20 regulars. The actual dimensions of your tank will ultimately depend on how many fish you can get.

I, personally, would go with a coupla schools of barbs or tetras as my main swimmers and then get a school of corys as my bottom swimmers.
I'm only aware of 2 twenty gallon sizes - longs (30x12x12) and highs (24x12x16). What's the difference between a high and a regular?

No matter the dimensions, I don't think a 20 is large enough for more than one school of barbs (and even then not big enough for most species), unless you are including rasboras since they are also cypranids. I know a lot of people keep corys in small tanks, but I would not keep them in less than a 30 inch long tank.
 

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I consider highs as just that, actual tall tanks. I never call regular tanks high. To me, it adds a bit of confusion. Depending on the size of the fish and how big the school is, there can be a coupla schools.

Example: 6 neons and 6 Skirt Tetras. Corys don't really do a whole lot of long range swimming, so I think they'd do perfectly fine in a 20 gallon. I've seen em so some, but mostly up n downs.
 

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I'm only aware of 2 twenty gallon sizes - longs (30x12x12) and highs (24x12x16). What's the difference between a high and a regular?
There are those two sizes as well as a 20 xhigh (20X10X24). I'm thinking that's what FishyFishy89 meant, but just got confused with the names.
 

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There are those two sizes as well as a 20 xhigh (20X10X24). I'm thinking that's what FishyFishy89 meant, but just got confused with the names.
20 high is the standard 20 gallon size. I think there's a 20 hex too. I didn't know that there were extra highs. Not sure why anyone would want one, to be honest :)

I've kept corys in tanks from 10 gallons to 90 gallons - that's what's influenced my feelings on the matter.
 

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Provided an opportunity to live long enough, goldfish grow quite large.


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