Look for a book called ecology of the planted aquarium by Diana walstad. Tells you everything. But basically, if you plant heavily enough with fast growing plants from the start, you can add fish within minutes. And it's completely safe.
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Try at Amazon - that's where I bought mine. I planted my 10 gallon heavily with fast-growing plants relying on stem plants and bought seven Pristella Tetras. I think you have found a good place for answers here.