I've read that (6 page!

) thread "What's happened to my baby". Some interesting stuff in there. I don't know if this is useful at all, but my 4ft tank, up until recently when I bought my RO unit, only got tapwater changes and the pH remained at 7.8 - totally stable, no variations irregardless of what time of day I took the reading. In two years, the KH and GH have lowered just a little, and there is lots of bogwood in there. I know that buffering capacity will drop over time due to exchange of hydrogen/hydroxyl ions (though don't ask me to explain this...

) I personally haven't noticed that bogwood makes much difference to the water. I know that technically it releases tannins, etc, which acidify the water, but I really haven't noticed much change. I started out with two small pieces and have quite a few now. I've not noticed any change in the water from adding bogwood. Only since I've started using RO for water changes, have noticeable changes occured.
Now... more questions...

If I house them in the 2ft temporarily (it IS mature by the way) what should I give them to hide in? There is only one small piece of bogwood in there, but it doesn't offer much cover. Should I plop a few bits of pipe in there, or something? Maybe just get some small pieces of slate from the LFS and stack them up?
Also... will it matter that the current in there is normal? Just a UGF with two bubble columns (whatever they're called - I don't know much about UGFs. I inherited this one and keep meaning to change it!) Should I raise the current for them? I'm not sure how yet, but if it's important, I will figure it out. However, there are other fish in there. 2 x Golden Honey Gourami (dwarfs), 5 x Harlequin Rasboras, 2 x Otos and a guppy, so I have to be a little careful with current. Don't want the other fish to swim themselves to death!