Thats an old picture from before the tank was stocked. The goldfish are just random pondfish that were thrown in mid-cycle to help out/act as mine pigeons. As for the tap water, I have an artesian well that is 0 ammonia, 0 nitrates, 0 nitrites, 7.8ph, haven't tested general hardness - definately not the problem. Where the nitrites are coming from is from the processing of the unusually large amounts of ammonia being produced by the rotting wood. This piece is over 3 feet long. I've seen concentrations in the tank as high as 1.6mg/L of nitrites and some pretty stressed fish. When the levels get this high, it takes at least 2-3 50% water changes to get them back to 0.3mg/L. As I said above, I took some small chunks of spongy wood and put them in a separate container. After about 36 hours 3-5 grams of wood produced enough ammonia in about a quart of water to show up in a test and qualitatively, the smell inside the sealed container was of rotting wood. The piece was power washed, soaked for 2 weeks in a 20% bleach solution and then soaked several times in fresh water before being dried and then re-soaked before being put in the tank. Before putting it in, there were a couple small spots that I was concerned about, but nothing to the extent of whats shown up in the last month or so.
As far as what will be left in the tank as far as surface area for colonies, there is ample bio-filtration, lots of small river rocks, some slate, a bunch of large plastic plants, a piece of mopani that was from an established tank and some american red mangrove seed pods that are finally beginning to germinate. I'm not concerned about the expense of the driftwood as my brother in law runs an exotics distributor(
www.piczo.com/eliteexotics) and they pick and prepare their own and I didn't pay much of anything for it. I just hate to lose such a nice piece. Oh well, I guess he can reblanch it and pass it on to someone for a terrarium. In the meantime, I have some work ahead of me, dismantling the canopy and wiring to get this thing out(again, it's over 3 feet long)
PS - that's the brother in law, not me ^^^