given that your tank has been going a month and reading zero, i think you should be ok to put something small in. keep in mind your cycle was likely done with very low bioload, and you should be starting small to build it. I would start with some snails and possibly a crab or one small fish. wait a week or so to add another. shrimp are fairly sensitive, so put those off until you're tank has settled out from the added livestock.
if you ever decide you want corals, you should start testing for alkalinity and calcium at least.
anyone else have something to add?
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