11-10-2010, 06:02 PM
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This is not easy to define, I have tried previously [I wrote that article by the way]. In your 10g, I would say you are half way there, though I do not know the extent of the Anacharis. If the two bunches occupy half or more of the tank, and are really growing, you're OK.
The type of plants also affects this. Anubias is slow-growing, so it uses fewer nutrients, and that means less ammonium (from the ammonia produced by fish and bacteria). Thus, it will not have the same effect as fast-growing stem plants (like the Anacharis) which require more nutrients and thus assimilate much more ammonium/ammonia. Provided they are truly growing; this plant frequently does not do too well, as it does not really like warm (tropical tank) temperatures as much.
Ideal plants for a 10g to grow relatively fast are most of the stem plants, the pygmy chain sword plant, and floating plants like Ceratopteris cornuta (this one consumes a lot of nutrients). Click on the shaded names to see the plant profile of these.