12-04-2010, 01:13 PM
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Well, the plants you have probably aren't enough to cycle the tank by themselves (at least not much faster than a fish cycle), but they are probably the reason your ammonia is so low.
As for fish, Balas, I believe, need to be kept in small groups, as well as neons (neon tetra I am assuming). The Balas, as they get bigger, might become more aggressive. They might start attacking the neon tetras. They may not due to the large size of the tank, though.
Read our TFK fish profiles, on the blue tab at the top-left of the screen. Hope this helps!