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I currently have 4 neon tetras and 2 swordtails, I was thinking of getting 2 more tetras but can I get anything else? If so, are there any cool schooling fish that i can get?
Centerpiece fish is basically a fish that is the highlight of your tank. So, you have schooling fish and other sorts, and then you have one stand out fish that is your centerpiece.
IMO I would boost your filtration, you usally want double the filtration of your tank, so like 30+gallons so that you can be a little more lenient on your stock. I would not add anything else at the mo.