01-07-2012, 08:00 PM
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Yes, nice hardscape. And welcome to Tropical Fish Keeping forum; nice to have you joining us.
If I read you correctly, you've removed the filter and are now relying on the plants. Provided the tank has been running a while, so it is established, and the fish load is low to moderate for the tank's water volume, you should be OK. Most of the beneficial bacteria is in the substrate, not the filter, so just don't touch the substrate at water changes. You have several stem plants which are faster growing so they will soon be assimilating much of the ammonia/ammonium.
The plant in the photo for ID is I think one of the Ophiopogon species, common names like Fountain Plant or sometimes grass plant. It is strictly speaking a terrestrial plant, but it usually does fairly well submersed, often lasting for months depending upon the species (there are 3 I am aware of, maybe more). From the photo I would guess it is O. japonicus, the species that often does well in aquaria.