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so i recently got a 20 gallon long and was wondering hmm what would be something super crazy i could do in this tank. then i thought it would be pretty cool to have a huge swarm of small schooling/ shoaling fish (green tetras, rice fish etc). how many/what type do you think i could house in a 20 gal?
 

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I have 15 fat & happy Glowlight Tetra in my 20G Long with a few Amano shrimps.
 

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Do like 30-40 danios (preferably eurythmics on or like 40 micro rasbora or sundadanio with a badis pair and like 6 sparkling gouramis

All those fish have tiny bioload. If you make sure the tank is dirted and planted it would be perfectly fine my friend has 6 sparklings and 20 boras in a 10g no filter walstad/father fish method tank.
 

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Depends on how large the fish are. I agree that you should try out Sundadanio sp. Another one that'd be cool would be any of the Boraras species. It sounds like you want a midwater swimming species that isn't shy.
 
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