06-09-2008, 01:34 PM
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The value of adding a whole school of fish together is that it will probably result in them sticking together in the tank afterwards.
I have a very similar 30 gal tank to yours that I started from scratch 4 month ago. I started it clean with sand substrate and new decorations, new filter, seeded it by setting one 8 oz. cup of gravel from a well established tank in it. 3 days later I added a black molly that needed to move or else die in fights with my synodontis. Got a very small ammonia spike, then it settled down. 7 days after the Molly I added 9 neon tetras. I tested the water daily, no ammonia spikes. A week later, 6 harlequin rasboras, again no spikes.
My interpretation was that with small fish like these, the bio-load on a 30 gallon tank is pretty minimal. Just be careful not to overfeed during the cycle (or ever) and closely monitor the water params. Do water changes as needed. You should do fine.