You can easily increase your number of rummynose tetras to 8.
As to can you add more? Assuming your filter is up to the job and you are prepared to put in the work of maintaining water quality, no real reason you couldnt go up to 20. 50% weekly water changes. Add them in slowly to give your cycle chance to catch up, monitor water quality as you do to make sure you are overloading the system.
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Aiken Drum
Community Moderator
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