02-14-2012, 09:40 AM
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I'm afraid you don't have room in a 6g tank for any additional fish. You could only add some invertebrates likes shrimp or snails. While technically you could keep some small size fish alive ... they wouldn't be happy in such a small volume of water. You do not need more fish to 'fertilize' the plants, you can buy a liquid fertilizer for that (for example Flourish). However, with such a small volume of water you'll need a syringe probably to measure the dose (a 1mL or 1 cc one - a cubic centimeter is equal to 1 mL if you didn't know).
Plus most fish (including loaches) need to be in a school of at least 6 fish, even without the beta you don't have room for that.
Some of the plants you have chosen, mainly the stem plants, can grow to be quite large and will require regular trimming to keep them in check. They will be slow at first as the ecosystem establishes but they'll get to the point of growing a couple inches a week.
You mentioned your tank was filled to the brim? Make sure there is some space there for the Betta to breath... they get their oxygen from the air by breathing, not from the water with gills.
As an FYI, large tanks are far, far easier to maintain than small ones ;) They are more forgiving to mistakes and give you more options for everything (types of fish, plants, decor, lighting, filtering, etc).