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It may be overstocked to begin with but as it will be a planted tank that is located right next to the kitchen sink for lots of water changes if necessary, I think it will work.
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If you want the plants to help you with keeping the water clean, you need to have them very densely planted, and you need to have lots of fast-growing plants (to absorb lots of ammonia or nitrate). The of the plants the you want to keep, only the watersprite is a fast-growing plant. And it's not guaranteed to grow, it's slowly dying in my tank, but maybe I'm just unlucky. So I don't think that the planting level you have in mind will allow for any overstocking....
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Well, I plan on adding fish slowly, to prevent shock and disease, so I think I will be able to see when enough is enough.
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Adding fish slowly isn't sufficient to prevent disease. If your fish has a disease that it picked up from the fish shop, it will spread it to your other fish anyway. The best way to prevent disease is to quarantine your fish in a separate tank. I must admit that I don't do that (I only have two tanks, a 20 gallon at home and a 5 gallon at work). What I do instead is that I only buy fish from two shops among the dozen or so fish shops within 15 miles of my house. These two shops take very good care of their fish, and they never have dead fish in their tanks. NEVER buy fish from a shop that has dead fish in ANY of its tanks. Also watch out for sick or fish that look like they're acting strange, not just in the tank that you want to buy fish from, but from any tank. If the shop doesn't know how to take care iof its fish in any tank, there's a good chance that the fish you buy will be weak of diseased.
And how will you know when enough is enough? The problem is that often the pictures of fish that we see are of tanks that are overcrowded. The tanks in shops generally are a bit overcrowded. They can get away with this because the fish are in there only a short time, and then they expect that you will put them in a tank where they will have more room to swim and grow. And pictures that manufacturers provide of their tanks generally show them overcrouwded as well.
As for us, we've gradually, over 7 months, built up the stock in our 20 gallon tank to 11 small to medium sized fish (the biggest ones are rosy barbs which are about 3 inches long). I think it's almost full. Up until we added the last 2 fish, it looked a little bit bare, but now there are enough fish in there that there's always something moving around out in the open, and it's a real pleasure to watch. I think we'll add just 2 more (adding more of the things we already have) and we'll call that quits. That will give us a healthy tank which will look really good. I'll continue to fiddle around with the plant selection, though, until I find just the right arrangement of plants that will look nice, grow well without any help from me, but also not grow too fast, cause I don't want to be continually trimming them!