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18,204 Posts
Step 1: Stop "cycling" your tank with live fish. It's beyond cruel. Rehome them immediately. There's no reason you can't use other methods in 2021. Harsh, I know, but not as harsh as what you're doing to your fish. Seriously. Just use a different ammonia source.
You say you're using RO water. How is it remineralized?
Which specific substrate?
Watts per gallon isn't really a thing, so could you tell us more about your lighting and the tank? How far from the substrate will the light be? Is there a tank lid?
As far as inhabitants that can go a week without being fed... you're looking at invertebrates. But since you want an autofeeder (they all have their pros and cons but some are great - I have an old Eheim that I still use), you should be able to keep most of the tiny fish available in the hobby today.
You say you're using RO water. How is it remineralized?
Which specific substrate?
Watts per gallon isn't really a thing, so could you tell us more about your lighting and the tank? How far from the substrate will the light be? Is there a tank lid?
As far as inhabitants that can go a week without being fed... you're looking at invertebrates. But since you want an autofeeder (they all have their pros and cons but some are great - I have an old Eheim that I still use), you should be able to keep most of the tiny fish available in the hobby today.
