01-27-2012, 06:39 AM
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Yes, wayyyy to many fish for a 10g. For that small of a tank, it's usually best to do a single species, or two at most since the majority of fish are schooling in nature. That means they like to be in a group of at least 6, but prefer even more. It makes them feel safe.
As mentioned, all those larger fish need to go.
Your Ammonia is literally off the charts, while plants will use it as food too much is also toxic to them. An airstone is generally not needed with a HOB (hang on back) filter since the falling of the water into the tank is plenty. Plants do best with a calm surface because it helps retain more CO2 that they need. And yes, too much oxygen is bad for plants just like too much CO2 is bad for us.
The plants will also need fertilizers of some kind. At the least, use a liquid fertilizer. Flourish is what a lot of people use, and the small 250 mL bottle will last you years (it does not expire). You would does no more than 1mL per week. The swords would enjoy a root tab (solid fertilizer that goes into the substrate near the plant) as they are heavy root feeders. For lighting, get a timer (same ones you use for lamps) and set it for 8 or 10 hours a day. Any more than that, and you'll risk algae.
The fern (I assume is Java Fern) has a rhizome, that's the rooty mass at the base. It should not be buried in the substrate as it will start to rot. They prefer to be attached to driftwood, rocks, or decorations, but you can also have it sitting on top of the substrate. You can use cotton thread to tie it down.
You need to do daily partial water changes (50%) to get that ammonia under control, a fishless cycle is best as it won't harm any fish, there is a sticky at the top of this forum explaining different methods. Even after water parameters stabilize, you still need to do weekly water changes (25-50%) to keep nitrates down.